Reconnecting with old friends from school may seem a nice idea, and in many ways it is. You have a lot to talk about, stories to tell, reminiscences to bond over. But you may reconnect with someone you once adored from afar. And now that you’re all grown-up you may get the urge to explore feelings that went unrequited 20 or 30 years ago. If you’re already in a relationship this could spell disaster.