We’ve all let our friendly relationship with an ex get a little too friendly, right? Well, according to some research, that may not be the worst thing! But before you get too excited and start hitting send on those 3am “U up?” texts after a bad date with someone new, check out the facts on why so many of us are prone to hooking up with our exes and hear the sordid stories to make you feel less alone in the process. Watch this before reigniting that spark with an ex or signing up for a new dating app.