Stealing Someone's Boyfriend Might Not Be the Best Idea

Aside from the obvious.

Have a crush on a guy who's taken? According to a new study, if he's good enough for you in the first place, he won't leave his current girlfriend for you. Research published in the Journal of Research in Personality showed that people who were "poached" from an old relationship tend to be worse at keeping the new one going.
Researchers tracked 138 heterosexual people (the study did not track gay or lesbian relationships) over nine weeks. All the participants were in relationships ranging from zero to 36 months. Both men and women who were "poached" out of another relationship started the study saying they were less satisfied in their new coupling than people who were not poached. They also were less committed, actively sought out alternatives, and cheated on their significant others more. And as the relationships progressed, things only got worse.
A follow-up study sought to figure out why poached people were less committed. Researchers asked 219 more heterosexual participants to fill out a survey about their current relationship, plus their personality and attitudes. What they found did not look good. "Individuals who were successfully mate poached by their current partners tend to be socially passive, not particularly nice to others, careless and irresponsible, and narcissistic," lead researcher Joshua Foster wrote.
All of this makes sense; if you're unable to maintain an intimate, faithful relationship, you're more likely to leave your current partner for someone else. So think of that next time you want to steal someone's boyfriend — if he's willing to leave his girlfriend, he might do the same thing to you later on.