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Why do we remain in romantic relationships that leave us unhappy and unfulfilled? The answer in two new studies co-authored by a University of Toronto researcher might surprise you.

Research  found that people are less likely to initiate a breakup when they believe that their romantic partners are dependent on the relationship. Participants in the studies, even people who had been close to breaking up, were motivated to remain in unsatisfying situations because they considered not only their own desires but also how much their partners wanted and needed the relationship to continue.

“People stay in relationships for the sake of their partners, even if they feel unappreciated by them,” says Emily Impett, an associate professor of psychology and director of the Relationship and Well-Being (RAW) Laboratory at �Թϱ��� Mississauga. She says that there are “self-focused” reasons why people choose to remain in a relationship – because of the time, resources and emotions they’ve invested in it, or because they don’t have good alternatives – but the research shows they also make “pro-social” altruistic decisions to stay because they feel their mates are committed.

The studies, headed by Samantha Joel, a former graduate student of Impett’s who is now at Western University, with additional co-authors Geoff MacDonald, a professor of psychology at �Թϱ���,  and Stephanie S. Spielmann, a �Թϱ��� alumna now at Wayne State University, used online questionnaires and followup interviews to track thousands of participants.

In the first study, which looked at people in romantic relationships in general, 18 per cent of participants broke up after 10 weeks, while in the second study, 29 per cent of people who’d been contemplating breakups called it quits after two months, Impett says. Across the two studies, she says that many of those who stayed did so because “they felt that a breakup would be distressing to their partners.”

Impett (pictured left) is a social personality psychologist who specializes in “giving” in close relationships – the “enormous daily sacrifices we make” – such as romantic partners who aren’t in the mood “in the bedroom” to parents who unfailingly care for their children.

For example, she says the RAW Lab is looking for 200 couples who know that they will soon be moving to a new city to accommodate one partner’s career ambitions, in order to investigate how they cope with the situation and challenges over time.

There’s a wide range of research continuing in the field, she says, such as a large breakup study looking at why people bail in relationships and a “sex-with-an-ex" study that has so far found that sleeping with a former partner isn’t harmful to people and increases positive emotions.

Impett says the next step for the research on partners’ “pro-social” motivations is to get “dyadic data” that includes the second partner, for example, to see whether the perception that a breakup might be traumatic to the partner is correct.

“Also, if you’re staying in a relationship and you’re unhappy and your partner is able to pick up on that, that’s got to have an effect on the partner,” Impett says.

The goal of such studies is to eventually partner with clinical psychologists to reach couples dealing with these challenging issues, says Impett, who notes that “everyone can relate…this is people’s lives,” but her research is statistics-based. For example, she teaches a large undergraduate course at �Թϱ��� Mississauga on interpersonal relationships where students “come in with their own lay beliefs about relationships and how they work,” she says. “I ask them, ‘What is the science?’”

Impett herself can appreciate the “giving” issues that she researches—she’s the mother of three children and her husband moved from San Francisco to Mississauga when she got her job in 2010.

"Life is full, and you get what you give,” she says.