Partnering up can help you grow as an individual – here's the psychology of a romantic relationship that expands the self – The Conversation

Relationship

Professor of Psychology, Monmouth University
Gary W. Lewandowski Jr. does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.
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It’s common to want to become a better version of yourself. Much like the desires to eat, drink and avoid harm, human beings also experience a fundamental need to learn, grow and improve – what psychologists call self-expansion.
Consider your favorite activities. Things like reading a book, spending time in nature, volunteering with a new organization, taking a class, traveling, trying a new restaurant, exercising or watching a documentary all broaden the self. Those experiences add new knowledge, skills, perspectives and identities. When who you are as a person expands, you enhance your competence and capabilities and increase your ability to meet new challenges and accomplish new goals.
Of course, you can achieve self-expansion on your own by trying new and interesting activities (like playing Wordle), learning new things (like advancing through a language app) or working on a skill (like practicing meditation). Research confirms that these kinds of activities help individuals expand themselves, which encourages them to put forth more effort on subsequent challenging tasks.
Interestingly, romantic relationships can also be a key source of growth for people. As a relationship scientist for over 20 years, I’ve studied the effects all kinds of romantic relationships can have on the self. Today’s modern couples hold high expectations for a partner’s role in one’s own self-development.
Falling in love feels good, and spending time with a romantic partner is enjoyable, but love’s benefits run even deeper. People tend to value partners who help them become a better version of themselves.
One way to optimize self-growth in your relationship is by sharing in your partner’s unique interests and skills. When “me” becomes “we,” partners blend their self-concepts and include the other in the self. That merging encourages partners to take on each other’s characteristics, quirks, interests and abilities to some extent. Romantic partners inevitably have different life experiences, knowledge bases, perspectives and skills. Each area is an opportunity for growth.
For example, if your partner has a better sense of humor than you do, over time, yours will likely improve. If they have an eye for interior design, your ability to put together a room will evolve. A partner’s differing views on climate change, politics or religion will grant you new perspectives and a deeper understanding of those topics. Your relationship helps you become a better person.
This isn’t to say that individuals should try to completely merge, running the risk of losing themselves. Rather, each person can maintain their own identity while augmenting it with desirable elements from their partner.
The science makes it abundantly clear that couples with more self-expansion are better relationships. Specifically, people who report more self-expansion in their relationship also report more passionate love, relationship satisfaction and commitment. It’s also associated with more physical affection, greater sexual desire, less conflict and couples being happier with their sex life.
Because self-expansion is so critical, when expanding relationships end, participants describe feeling like they have lost a part of themselves. Importantly, when less-expanding relationships break up, individuals experience positive emotions and growth.
When a relationship provides insufficient expansion, it can feel like it’s stuck in a rut. That stagnant malaise has consequences. Research finds that married couples who at one point indicated more boredom in their current relationship also reported less marital satisfaction nine years later. Insufficient relationship self-expansion also encourages people to have more of a wandering eye and pay more attention to alternative partners, increases susceptibility to cheating on one’s partner, lowers sexual desire and comes with a greater likelihood of breakup.
Maybe you’re now wondering how your own relationship is doing on this front. To provide some insight, I created the Sustainable Marriage Quiz. On a scale from 1 to 7, with 1 being “very little” and 7 being “very much,” answer these questions:
Before adding up your score, know that these categories are generalizations. They suggest where your relationship may need attention, but also where it’s already strong. Relationships are complicated, so you should see your score for what it is: one small piece of the puzzle about what makes your relationship work.
What makes a relationship great? While there are many factors to consider, one area deserves more attention: how much it helps you grow. A relationship that fosters self-expansion will make you want to be a better person, help you increase your knowledge, build your skills, enhance your capabilities and broaden your perspectives.
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