"It's complicated"

Ok so I have this guy friend that I grew up with.  He has had a crush on me since the 2nd grade.  Ok well I'm married and while I'm separated from my husband I'm still technically married.  He so wants more than a friendship and when we were hanging out yesterday it got a tad, intense but not completely sexual, like we didn't go "all the way."  He knows my current situation so I'm feeling kind of torn if that makes sense?  Advice would be helpful ?