The dating game is not the same as playing the mix and match game. My advice is to look for new material. This guy broke up with his girlfriend for me, and she is really upset. I think it would be best for you to not assume what he may or may not do. Instead, have a talk with him and discuss how you're feeling.
Men hate that expression.
It puts them on the defense right away and makes them feel wrong. You don't want to make a man, or for that matter, anyone feel wrong because they will shutdown. Don't accuse him - because he hasn't done anything, and don't attack him. Give him the space to be honest with you. And have enough self-confidence in yourself to care about your own feelings.