Does an unhappy partner make you less happy?

A study shows the more positive person is dragged down' by an unhappier partner - but relationships are still beneficial overall

When I meet a friend's new partner for the first time, I desperately want to like them. I hope they're generally pleasant to be around - not just for my sake, but for my friend's. When people date someone who is miserable, it can rub off on them. Maybe you have had that happy-go-lucky, upbeat friend who starts dating a grump, and gradually, they become an Eeyore too.

Research shows that people often become similar to who they spend a lot of time with. Even strangers tend to mimic each other's movements and expressions, and studies have shown that friends, strangers and lovers' heartbeats or brain waves often sync up. In romantic couples, a number of studies have shown that they have similar wellbeing, both when they first start dating and also over time.