I'd step away.
A few months back, I met this guy (a soror's in-law). We all were kicking it and having a great time. We both sense feelings. He knows he is engaged, I don't know at this point. After he reveals to me he is engaged:
1. I congratulated him on his upcoming nuptials
2. I told him, I wasn't LIKE THAT
3. I said I respect his fiancee', because that could be ME in the reversed situation.
4. Karma is a byatch, therefore, I wouldn't want something similar OR worse to happen to me or those close around me.
5. If he cheated on her to be with me, he will cheat on me to be with someone else.
I also distanced myself from him. I told him to remain focused on what he had with his future wife and not let a few social outings (with others) cloud your judgement. However, if it was meant for us to be together, then that will occur. So far, it hasn't and I'm with someone else. I learned that when one door closes, another opens. Boy, did it open.
Do not ever sell yourself short. If ole boy is married and is trying to 'holla', he is DISRESPECTFUL PERIOD! Don't EVER sell yourself short, not for a piece of (private parts). Basically, that's all he wants. After he gets you, he's going to discuss you across the table from his boys and you'll become a joke.
DATING MARRIED MEN= DRAMA! LEAVE IT ALONE!
disclaimer- I've never been in a relationship with a married man, but IT'S WRONG!
Tell him to flirt and holla when you see the divorce decree!