Most Helpful Guy
Your gut is wise, but you need to fill it with information or your head will kill you with thought. Basically, did he break up with her? Why do you think he has feelings, perhaps say something to show you're irritated like "you talk about your ex so much why don't you date her instead"!
Most Helpful Girl
So end things for yourself. Let him try coming to you, if he does, and if he convinces you to like him again you can always change your mind later. But right now it sounds like you don't want to stress over someone who isn't committed to you 100%. It makes sense. Make him work for it or don't worry about what he is doing. You do you bbgirl.