To this point in the chapter, we have focused upon the attraction that occurs between people who are initially getting to know one another. But the basic principles of social psychology can also be applied to help us understand relationships that last longer. When good friendships develop, when people get married and plan to spend the rest of their lives together, and when families grow closer over time, the relationships take on new dimensions and must be understood in somewhat different ways. Yet the principles of social psychology can still be applied to help us understand what makes these relationships last.

The factors that keep people liking and loving each other in long-term relationships are at least in part the same as the factors that lead to initial attraction. For instance, regardless of how long they have been together, people remain interested in the physical attractiveness of their partners, although it is relatively less important than for initial encounters. And similarity remains essential. Relationships are also more satisfactory and more likely to continue when the individuals develop and maintain similar interests and continue to share their important values and beliefs over time (Davis & Rusbult, 2001). Both actual and assumed similarity between partners tend to grow in long-term relationships and are related to satisfaction in opposite-sex marriages (Schul & Vinokur, 2000). Some aspects of similarity, including that in terms of positive and negative affectivity, have also been linked to relationship satisfaction in same-sex marriages (Todosijevic, Rothblum, & Solomon, 2005). However, some demographic factors like education and income similarity seem to relate less to satisfaction in same-sex partnerships than they do in opposite sex ones (Todosijevic, Rothblum, & Solomon, 2005).

Proximity also remains important—relationships that undergo the strain of the partners being apart from each other for very long are more at risk for breakup. For example, recall our chapter case study about Frank and Anita Milford’s 80-year marriage; the couple said that  “We do everything together even after nearly 80 years.”

But what about passion? Does it still matter over time? Yes and no. People in long-term relationships who are most satisfied with their partners report that they still feel passion for their partners—they still want to be around them as much as possible, and they enjoy making love with them (Simpson, 1987; Sprecher, 2006). And they report that the more they love their partners, the more attractive they find them (Simpson, Gangestad, & Lerma, 1990). On the other hand, the high levels of passionate love that are experienced in initial encounters are not likely to be maintained throughout the course of a long-term relationship (Acker & Davis, 1992). Recall, though, that physical intimacy continues to be important. Frank and Anita from our case study, for example, said that they still put great importance on sharing a kiss and a cuddle every night before bed.

Over time, cognition becomes relatively more important than emotion, and close relationships are more likely to be based on companionate love, defined as love that is based on friendship, mutual attraction, common interests, mutual respect, and concern for each other’s welfare. This does not mean that enduring love is less strong—rather, it may sometimes  have a different underlying structure than initial love based more on passion.

Closeness and Intimacy

Although it is safe to say that many of the variables that influence initial attraction remain important in longer-term relationships, other variables also come into play over time. One important change is that as a relationship progresses, the partners come to know each other more fully and care about each other to a greater degree. In successful relationships, the partners feel increasingly close to each other over time, whereas in unsuccessful relationships, closeness does not increase and may even decrease. The closeness experienced in these relationships is marked in part by reciprocal self-disclosure—the tendency to communicate frequently, without fear of reprisal, and in an accepting and empathetic manner.

When the partners in a relationship feel that they are close, and when they indicate that the relationship is based on caring, warmth, acceptance, and social support, we can say that the relationship is intimate (Sternberg, 1986). Partners in intimate relationships are likely to think of the couple as “we” rather than as two separate individuals. People who have a sense of closeness with their partner are better able to maintain positive feelings about the relationship while at the same time are able to express negative feelings and to have accurate (although sometimes less than positive) judgments of the other (Neff & Karney, 2002). People may also use their close partner’s positive characteristics to feel better about themselves (Lockwood, Dolderman, Sadler, & Gerchak, 2004).

Arthur Aron and his colleagues (Aron, Aron, & Smollan, 1992) have assessed the role of closeness in relationships directly, using the simple measure shown in Figure 7.8, “Measuring Relationship Closeness.” You might try completing the measure yourself for some different people that you know—for instance, your family members, your friends, your spouse, or your girlfriend or boyfriend. The measure is simple to use and to interpret. If a person chooses a circle that represents the self and the other as more overlapping, this means that the relationship is close. But if they choose a circle that is less overlapping, then the relationship is less so.

This measure is used to determine how close two partners feel to each other. The respondent simply circles which of the figures he or she feels characterizes the relationship. From Aron, Aron, and Smollan (1992).

Although the closeness measure is simple, it has been found to be highly predictive of people’s satisfaction with their close relationships and of the tendency for couples to stay together. In fact, the perceived closeness between romantic partners can be a better predictor of how long a relationship will last than is the number of positive feelings that the partners indicate having for each other. In successful close relationships, cognitive representations of the self and the other tend to merge together into one, and it is this tie—based on acceptance, caring, and social support—that is so important (Aron, Aron, Tudor, & Nelson, 1991).

Aron and his colleagues (Aron, Melinat, Aron, & Vallone, 1997) used an experimental design to test whether self-disclosure of intimate thoughts to others would increase closeness. In a laboratory, they paired college students with another student, one whom they did not know. Some of the students were asked to share some intimate thoughts with each other by asking and answering questions such as “When did you last cry in front of another person?” In comparison with control participants who only engaged in small talk with their partners (answering questions such as “What is your favorite holiday?”), the students who disclosed more intimate experiences reported feeling significantly closer to each other at the end of the conversation.

Communal and Exchange Relationships

In intimate close relationships, the partners can become highly attuned to each other’s needs, such that the desires and goals of the other become as important as, or more important than, one’s own needs. When people are attentive to the needs of others—for instance, parents’ attentiveness to the needs of their children or the attentiveness of partners in a romantic relationship—and when they help the other person meet his or her needs without explicitly keeping track of what they are giving or expecting to get in return, we say that the partners have a communal relationship. Communal relationships are close relationships in which partners suspend their need for equity and exchange, giving support to the partner in order to meet his or her needs, and without consideration of the costs to themselves. Communal relationships are contrasted with exchange relationships, relationships in which each of the partners keeps track of his or her contributions to the partnership.

Research suggests that communal relationships can be beneficial, with findings showing that happier couples are less likely to “keep score” of their respective contributions (Buunk, Van Yperen, Taylor, & Collins, 1991). And when people are reminded of the external benefits that their partners provide them, they may experience decreased feelings of love for them (Seligman, Fazio, & Zanna, 1980).

Although partners in long-term relationships are frequently willing and ready to help each other meet their needs, and although they will in some cases forgo the need for exchange and reciprocity, this does not mean that they always or continually give to the relationship without expecting anything in return. Partners often do keep track of their contributions and received benefits. If one or both of the partners feel that they are unfairly contributing more than their fair share, and if this inequity continues over a period of time, the relationship will suffer. Partners who feel that they are contributing more will naturally become upset because they will feel that they are being taken advantage of. But the partners who feel that they are receiving more than they deserve might feel guilty about their lack of contribution to the partnership.

Members of long-term relationships focus to a large extent on maintaining equity, and marriages are happiest when both members perceive that they contribute relatively equally (Van Yperen & Buunk, 1990). Interestingly, it is not just our perception of the equity of the ratio of rewards and costs we have in our relationships that is important. It also matters how we see this ratio in comparison to those that we perceive people of the same sex as us receiving in the relationships around us. Buunk and Van Yperen (1991), for example, found that people who saw themselves as getting a better deal than those around them were particularly satisfied with their relationships. From the perspective of social comparison theory, which we discussed in chapter 3 in relation to the self, this makes perfect sense. When we contrast our own situation with that of similar others and we perceive ourselves as better off, then this means we are making a downward social comparison, which will tend to make us feel better about ourselves and our lot in life. There are also some individual differences in the extent to which perceptions of equity are important. Buunk and Van Yperen, for example, found that the relationship between perceptions of equity and relationship satisfaction only held for people who were high in exchange orientation. In contrast, those low in exchange orientation did not show an association between equity and satisfaction, and, perhaps even more tellingly, were more satisfied with their relationships than those high in exchange orientation.

People generally stay in relationships longer when they feel that they are being rewarded by them (Margolin & Wampold, 1981). In short, in relationships that last, the partners are aware of the needs of the other person and attempt to meet them equitably. But partners in the best relationships are also able to look beyond the rewards themselves and to think of the relationship in a communal way.

Interdependence and Commitment

Another factor that makes long-term relationships different from short-term ones is that they are more complex. When a couple begins to take care of a household together, has children, and perhaps has to care for elderly parents, the requirements of the relationship become correspondingly bigger. As a result of this complexity, the partners in close relationships increasingly turn to each other not only for social support but also for help in coordinating activities, remembering dates and appointments, and accomplishing tasks (Wegner, Erber, & Raymond, 1991). The members of a close relationship are highly interdependent, relying to a great degree on each other to meet their goals.

It takes a long time for partners in a relationship to develop the ability to understand the other person’s needs and to form positive patterns of interdependence in which each person’s needs are adequately met. The social representation of a significant other is a rich, complex, and detailed one because we know and care so much about him or her and because we have spent so much time in his or her company (Andersen & Cole, 1990). Because a lot of energy has been invested in creating the relationship, particularly when the relationship includes children, breaking off the partnership becomes more and more costly with time. After spending a long time with one person, it may also become more and more difficult to imagine ourselves with anyone else.

In relationships in which a positive rapport between the partners is developed and maintained over a period of time, the partners are naturally happy with the relationship and they become committed to it. Commitment refers to the feelings and actions that keep partners working together to maintain the relationship. In comparison with those who are less committed, partners who are more committed to the relationship see their mates as more attractive than others, are less able to imagine themselves with another partner, express less interest in other potential mates, are less aggressive toward each other, and are less likely to break up (Simpson, 1987; Slotter et al., 2011).

Commitment may in some cases lead individuals to stay in relationships that they could leave, even though the costs of remaining in the relationship are very high. On the surface, this seems puzzling because people are expected to attempt to maximize their rewards in relationships and would be expected to leave them if they are not rewarding. But in addition to evaluating the outcomes that one gains from a given relationship, the individual also evaluates the potential costs of moving to another relationship or not having any relationship at all. We might stay in a romantic relationship, even if the benefits of that relationship are not high, because the costs of being in no relationship at all are perceived as even higher. We may also remain in relationships that have become dysfunctional in part because we recognize just how much time and effort we have invested in them over the years. When we choose to stay in situations largely because we feel we have put too much effort in to be able to leave them behind, this is known as the sunk costs bias (Eisenberg, Harvey, Moore, Gazelle, & Pandharipande, 2012). In short, when considering whether to stay or leave, we must consider both the costs and benefits of the current relationship and the costs and benefits of the alternatives to it (Rusbult, Olsen, Davis, & Hannon, 2001).

Although the good news about interdependence and commitment is clear—they help relationships last longer—they also have a potential downside. Breaking up, should it happen, is more difficult in relationships that are interdependent and committed. The closer and more committed a relationship has been, the more devastating a breakup will be.

What Is Love?

Although we have talked about it indirectly, we have not yet tried to define love itself—and yet it is obviously the case that love is an important part of many close relationships. Social psychologists have studied the function and characteristics of romantic love, finding that it has cognitive, affective, and behavioral components and that it occurs cross-culturally, although how it is experienced may vary.

Robert Sternberg and others (Arriaga & Agnew, 2001; Sternberg, 1986)  have proposed a triangular model of love, an approach that suggests that there are different types of love and that each is made up of different combinations of cognitive and affective variables, specified in terms of passion, intimacy, and commitment. The model, shown in Figure 7.9, “Triangular Model of Love,” suggests that only consummate love has all three of the components (and is probably experienced only in the very best romantic relationships), whereas the other types of love are made up of only one or two of the three components. For instance, people who are good friends may have liking (intimacy) only or may have known each other so long that they also share commitment to each other (companionate love). Similarly, partners who are initially dating might simply be infatuated with each other (passion only) or may be experiencing romantic love (both passion and liking but not commitment).

The triangular model of love, proposed by Robert Sternberg. Note that there are seven types of love, which are defined by the combinations of the underlying factors of intimacy, passion, and commitment. From Sternberg (1986).

Research into Sternberg’s theory has revealed that the relative strength of the different components of love does tend to shift over time. Lemieux and Hale (2002) gathered data on the three components of the theory from couples who were either casually dating, engaged, or married. They found that while passion and intimacy were negatively related to relationship length, that commitment was positively correlated with duration. Reported intimacy and passion scores were highest for the engaged couples.

As well as these differences in what love tends to look like in close relationships over time, there are some interesting gender and cultural differences here. Contrary to some stereotypes, men, on average, tend to endorse beliefs indicating that true love lasts forever, and to report falling in love more quickly than women (Sprecher & Metts, 1989). In regards to cultural differences, on average, people from collectivistic backgrounds tend to put less emphasis on romantic love than people from more individualistic countries. Consequently, they may place more emphasis on the companionate aspects of love, and relatively less on those based on passion (Dion & Dion, 1993).

Individual Differences in Loving: Attachment Styles

One of the important determinants of the quality of close relationships is the way that the partners relate to each other. These approaches can be described in terms of attachment style—individual differences in how people relate to others in close relationships. We display our attachment styles when we interact with our parents, our friends, and our romantic partners (Eastwick & Finkel, 2008).

Attachment styles are learned in childhood, as children develop either a healthy or an unhealthy attachment style with their parents (Ainsworth, Blehar, Waters, & Wall, 1978; Cassidy & Shaver, 1999). Most children develop a healthy or secure attachment style, where they perceive their parents as safe, available, and responsive caregivers and are able to relate easily to them. For these children, the parents successfully create appropriate feelings of affiliation and provide a secure base from which the child feels free to explore and then to return to. However, for children with unhealthy attachment styles, the family does not provide these needs. Some children develop an insecure attachment pattern known as the anxious/ambivalent attachment style, where they become overly dependent on the parents and continually seek more affection from them than they can give. These children are anxious about whether the parents will reciprocate closeness. Still other children become unable to relate to the parents at all, becoming distant, fearful, and cold (the avoidant attachment style).

These three attachment styles that we develop in childhood remain to a large extent stable into adulthood (Caspi, 2000; Collins, Cooper, Albino, & Allard, 2002; Rholes, Simpson, Tran, Martin, & Friedman, 2007).  Fraley (2002) conducted a meta-analysis of 27 studies that had looked at the relationship between attachment behavior in infants and in adults over 17 years of age and found a significant correlation between the two measures. A fourth infant attachment style has been identified more recently, the disorganized attachment style, which is a blend of the other two insecure styles. This style also shows some links to adulthood patterns, in this case an avoidant-fearful attachment style.

The consistency of attachment styles over the life span means that children who develop secure attachments with their parents as infants are better able to create stable, healthy interpersonal relationships with other individuals, including romantic partners, as adults (Hazan & Diamond, 2000). They stay in relationships longer and are less likely to feel jealousy about their partners. But the relationships of anxious and avoidant partners can be more problematic. Insecurely attached men and women tend to be less warm with their partners, are more likely to get angry at them, and have more difficulty expressing their feelings (Collins & Feeney, 2000). They also tend to worry about their partner’s love and commitment for them, and they interpret their partner’s behaviors more negatively (Collins & Feeney, 2004; Pierce & Lydon, 2001). Anxious partners also see more conflict in their relationships and experience the conflicts more negatively (Campbell, Simpson, Boldry, & Kashy, 2005).

In addition, people with avoidant and fearful attachment styles can often have trouble even creating close relationships in the first place (Gabriel, Carvallo, Dean, Tippin, & Renaud, 2005). They have difficulty expressing emotions, and experience more negative affect in their interactions (Tidwell, Reis, & Shaver, 1996). They also have trouble understanding the emotions of others (Fraley, Garner, & Shaver, 2000) and show a relative lack of interest in learning about their romantic partner’s thoughts and feelings (Rholes, Simpson, Tran, Martin, & Friedman, 2007).

One way to think about attachment styles, shown in Table 7.1, “Attachment as Self-Concern and Other-Concern,” is in terms of the extent to which the individual is able to successfully meet the important goals of self-concern and other-concern in his or her close relationships. People with a secure attachment style have positive feelings about themselves and also about others. People with anxious/ambivalent attachment styles feel good about themselves (the goal of self-concern is being met), but they do not have particularly good relations with others. People with avoidant attachment styles are primarily other-concerned. They want to be liked, but they do not have a very positive opinion of themselves; this lack of self-esteem hurts their ability to form good relationships. The fourth cell in the table, lower right, represents the avoidant-fearful style, which describes people who are not meeting goals of either self-concern or other-concern.

This way of thinking about attachment shows, again, the importance of both self-concern and other-concern in successful social interaction. People who cannot connect have difficulties being effective partners. But people who do not feel good about themselves also have challenges in relationships—self-concern goals must be met before we can successfully meet the goals of other-concern.

Table 7.1 Attachment as Self-Concern and Other-Concern

	Self-concern	Other-concern
Goals are met	Secure attachment (Healthy feelings about the self and about important others)	Avoidant attachment (Healthy feelings about the self but fears about connecting with others)
Goals are not met	Anxious/ambivalent attachment (Desires to reach out to others but also anxious about the self)	Fearful attachment (Relationships with others are poor but so is the self-concept)

Because attachment styles have such an important influence on relationships, you should think carefully about your potential partner’s interactions with the other people in his or her life. The quality of the relationships that people have with their parents and close friends will predict the quality of their romantic relationships. But although they are very important, attachment styles do not predict everything. People have many experiences as adults, and these interactions can influence, both positively and negatively, their ability to develop close relationships (Baldwin & Fehr, 1995; Scharfe & Bartholomew, 1994). There is also some diversity in the distribution of attachment styles across different groups. For example, in a multicultural sample including people from over 50 different countries of origin, Agishtein and Brumbaugh (2013) found that attachment style varied as a function of ethnicity, religion, individualism-collectivism, and acculturation. For instance, anxious attachment was found to be significantly higher in those whose countries of origin were in East Asia, the Middle East, and Eastern Europe, compared with those from nations in South America, the Caribbean, North America, Western Europe, and South Asia. These types of findings clearly remind us of the need to consider cultural diversity when we are reviewing the research on attachment. They also raise the interesting possibility that some types of attachment may be more normative and adaptive in some cultures than others.

As well as showing some cross-cultural diversity, attachment styles within individuals may be more diverse over time and across situations than previously thought. Some evidence suggests that overall attachment style in adults may not always predict their attachment style in specific relationships. For instance, people’s attachment styles in particular relationships, for example those with their mothers, brothers, and partners, although often correlated, can also be somewhat distinct (Pierce & Lydon, 2001; Ross & Spinner, 2001). As well as showing this variability across relationships, attachment styles can also shift over time and with changing relationship experiences. For example, there are some age-related trends in attachment, with younger adults higher in anxious attachment than middle-aged and older adults, and middle-aged adults higher in avoidant attachment than the other two groups (Chopik, Edelstein, & Fralay, 2013). In regards to changing experiences, people with an anxious style who find a very trusting and nurturing romantic relationship may, over time, come to feel better about themselves and their own needs, and shift toward a more secure style (Davila & Cobb, 2003). These findings have many potential psychotherapeutic settings. For example, couples who are attending therapy to address relationship issues can benefit from this process in part by developing more secure attachments to each other (Solomon, 2009). Therapists can also try to help their clients to develop a more secure attachment style, by creating a trusting and supportive relationship with them (Obegi, 2008).

Social Psychology in the Public Interest

Internet Relationships

As we saw in the chapter on Self, many of us are spending more time than ever connecting with others electronically. Online close relationships are also becoming more popular. But you might wonder whether meeting and interacting with others online can create the same sense of closeness and caring that we experience through face-to-face encounters. And you might wonder whether people who spend more time on Facebook, Twitter, and the Internet might end up finding less time to engage in activities with the friends and loved ones who are physically close by (Kraut et al., 1998).

Despite these potential concerns, research shows that using the Internet can relate to positive outcomes in our close relationships (Bargh, 2002; Bargh & McKenna, 2004). In one study, Kraut et al. (2002) found that people who reported using the Internet more frequently also reported spending more time with their family and friends and indicated having better psychological health.

The Internet also seems to be useful for helping people develop new relationships, and the quality of those relationships can be as good as or better than those formed face-to-face (Parks & Floyd, 1996). McKenna, Green, and Gleason (2002) found that many people who participated in news and user groups online reported having formed a close relationship with someone they had originally met on the Internet. Over half of the participants said that they had developed a real-life relationship with people they had first met online, and almost a quarter reported that they had married, had become engaged to, or were living with someone they initially met on the Internet.

McKenna, Green, and Gleason (2002) studied how relationships developed online using laboratory studies. In their research, a previously unacquainted male and female college student met each other for the first time either in what they thought was an Internet chat room or face-to-face. Those who met first on the Internet reported liking each other more than those who met first face-to-face—even when it was the same partner that they had met both times. People also report being better able to express their own emotions and experiences to their partners online than in face-to-face meetings (Bargh, McKenna, & Fitzsimons, 2002).

There are probably a number of reasons why Internet relationships can be so successful. For one, relationships grow to the extent that the partners self-disclose by sharing personal information with each other, and the relative anonymity of Internet interactions may allow people to self-disclose more readily. Another characteristic of Internet relationships is the relative lack of physical cues to a person’s attractiveness. When physical attractiveness is taken out of the picture, people may be more likely to form relationships on the basis of other more important characteristics, such as similarity in values and beliefs. Another advantage of the Internet is that it allows people to stay in touch with friends and family who are not nearby and to maintain better long-distance relationships (Wellman, Quan Haase, Witte, & Hampton, 2001). The Internet also may be helpful in finding others with shared interests and values. Finally, the major purpose of many Internet activities is to make new friends. In contrast, most face-to-face interactions are less conducive to starting new conversations and friendships.

Online interactions can also help to strengthen offline relationships. A recent study by Fox, Warber, & Makstaller (2013) explored the effects of publically posting one’s relationship status to Facebook, or going “Facebook official” (FBO) on romantic relationships between college students. They found that offline discussions between partners often preceded going FBO, and, that once couples had gone FBO, they reported more perceived relationship commitment and stability.

Overall, then, the evidence suggests that rather than being an isolating activity, interacting with others over the Internet helps us maintain close ties with our family and friends and in many cases helps us form intimate and rewarding relationships.

Making Relationships Last

Now that you have a better idea of the variables that lead to interpersonal attraction and that are important in close relationships, you should be getting a pretty good idea of the things that partners need to do to help them stay together. It is true that many marriages end in divorce, and this number is higher in individualistic cultures, where the focus is on the individual, than it is in collectivistic cultures, where the focus is on maintaining group togetherness. But even in many Western countries, for instance, the United States, the number of divorces is falling, at least for the most educated segments of society (Kreider & Fields, 2001). Successful relationships take work, but the work is worth it. People who are happily married are also happier overall and have better psychological and physical health. And at least for men, marriage leads to a longer life (Kiecolt-Glaser & Newton, 2001).

In part the ideas that Britain’s long-married couple Frank and Anita Milford have about what made their relationship so successful are probably correct. Let’s look at some of the things that they seem to have done and compare them with what we might expect on the basis of social psychological research.

• Be prepared for squabbles. Every relationship has conflict. This is not unexpected or always bad. Working through minor conflicts can help you and your partner improve your social skills and make the relationship stronger (Pickett & Gardner, 2005).
• Don’t be negative. Negative cognitions and emotions have an extremely harmful influence on relationships (Gottman, 1994). Don’t let a spiral of negative thinking and negative behaviors get started. Do whatever you can to think positively.
• Be fair in how you evaluate behaviors. Many people in close relationships, as do most people in their everyday lives, tend to inflate their own self-worth. They rate their own positive behaviors as better than their partner’s, and rate their partner’s negative behaviors as worse than their own. Try to give your partner the benefit of the doubt—remember that you are not perfect either.
• Do things that please your partner. The principles of social exchange make it clear that being nice to others leads them to be nice in return.
• Have fun. Relationships in which the partners have positive moods and in which the partners are not bored tend to last longer (Tsapelas, Aron, & Orbuch, 2009).

Partners who are able to remain similar in their values and other beliefs are going to be more successful. This seems to have been the case for Frank and Anita—they continued to share activities and interests. Partners must also display positive affect toward each other. Happy couples are in positive moods when they are around each other—they laugh together, and they express approval rather than criticism of each other’s behaviors. Partners are happier when they view the other person in a positive or even “idealized” sense rather than in a more realistic and perhaps more negative one (Murray, Holmes, & Griffin, 1996). Anita and Frank talked in their interview about how their time together was characterized by positive feelings and romance, and perhaps that helped them stay together.

Next, the partners must share, in the sense that they are willing to express their thoughts about each other. Successful relationships involve individuals self-disclosing their own needs and desires, which allows their partners to become aware of their needs and attempt to meet them if possible. If the partners are not able to express their concerns, then the relationship cannot become more intimate. Successful relationships have successful communication patterns.

Finally, but not least important, are sexual behaviors. Compatibility of sexual preferences and attitudes are an important predictor of relationship success. For instance, it is very important that partners are on the same page about how they feel about pursuing sex outside of the relationship, as infidelity in relationships is linked to increased risk of divorce (Wiederman, 1997).

Even if a partner does not actually have sex with someone else, his or her partner may still be jealous, and jealously can harm relationships. Jealousy is a powerful emotion that has been evolutionarily selected to help maintain close relationships. Both men and women experience jealousy, although they experience it to different extents and in different ways. Men are more jealous than women overall. And men are more concerned than women about sexual infidelities of their partners, whereas women are relatively more concerned about emotional infidelities of their partners (Buss, Larsen, Westen, & Semmelroth, 1992). Men’s concern with sexual cheating is probably due in part to evolutionary factors related to kin selection: men need to be particularly sure that their partners are sexually faithful to them to ensure that the time they spend raising children is spent on raising their own children, not those of others. And women’s concern with emotional fidelity fits with a focus on maintaining the relationship intact. Flirting suggests that the man is not really committed to the relationship and may leave it.

When Relationships End

Inevitably, some relationships do break up, and these separations may cause substantial pain. When the partners have been together for a long time, particularly in a relationship characterized by interdependence and commitment, the pain is even greater (Simpson, 1987). The pain of a breakup is in part due to the loneliness that results from it. People who lose someone they care about also lose a substantial amount of social support, and it takes time to recover and develop new social connections. Lonely people sleep more poorly, take longer to recover from stress, and show poorer health overall (Cacioppo et al., 2002).

The pain of a loss may be magnified when people feel that they have been rejected by the other. The experience of rejection makes people sad, angry, more likely to break social norms, and more focused on self-concern. The ability to effectively self-regulate is lowered, and people are more likely to act on their impulses (Baumeister, DeWall, Ciarocco, & Twenge, 2005). But people who have been rejected are also more motivated by other-concern; they are particularly likely to try to make new friends to help make up for the rejection (Gardner, Pickett, & Brewer, 2000). Although people who have been rejected are particularly hurt, people who have rejected others may feel guilty about it.

Breaking up is painful, but people do recover from it, and they usually move on to find new relationships. Margaret Stroebe and her colleagues (Stroebe, Hansson, Schut, & Stroebe, 2008) found that people adjusted to the loss of a partner, even one with whom they had been with for a long time, although many did have increased psychological difficulties, at least in the short term.