I love him but he’s married

So I met this guy a few years back we’ve been friends for a while... yes he was married then but I made sure that I respected her and their marriage.. well here in recent event they’ve separated she lives in another state and he now lives in the same place that I do.. well with us being friends of course we would hang out and chill well eventually one thing led to another and now it’s like we in a full relationship we spend time together he says he loves me anf not only that he shows it and of course we are doing the do but thing is I’m afraid bc he’s still married and my gut is telling me if given the chance he’d be with his wife (he left her)