8 signs you're in a strong relationship - even if it doesn't feel like it

Like any other annual holiday, Valentine's Day is a chance to reflect on everything that's happened - and all the ways you've grown - in the last year.

In this case, it's an opportunity to consider how your relationship has evolved, and (gulp) whether you think it'll last.

Psychologists have spent years studying the traits that are fundamental to successful long-term relationships and have come up with a few key ideas. We rounded up some of their most surprising insights below.

A word of caution: If you notice that your relationship doesn't meet all these criteria, that does not necessarily mean you should end things with your partner. Consider this list a general set of guidelines that can help you start evaluating whether your current relationship is bringing you satisfaction and happiness.