HELP! Pretty Confused?!?

Dont' contact him as he should make the first move. If he is in a relationship then it is up to him to break off with this person before getting involved with you. If he doesn't contact you after a couple of weeks you know what that means! He has made a BIG mistake that night and can't face telling you. His silence is a message to you. Loads of good guys out there so just sit tight