Hung Up On Something That May Not Happen

I dated this guy a year or two ago. We had a bad breakup and didn't talk for a while afterwards. A few months ago, we started hanging out at the same bar often, and started talking again. He would call and text me, and we would get together for drinks or something to eat. Eventually we did hook up again. Then things got a little weird after that. Now it mostly goes on and off with whether we are friendly again.  Right now we are friendly again and he will text me or we will hang out, and we have a great time when we do. We havent hooked up again recently, but I'm not sure exactly what he wants. We are not good enough friends to the point where its normal that we would just get together and hang out. Yet, being as I am his ex, why does he want to hang out? He also likes to keep tabs on what guys I am talking to and almost try to stop it if we are out at the same place. A few people I have talked to say he may still have feelings but just doenst know how to act. He keeps me hanging on just enough for me to not be able to let go yet, and when I am finally feel like I am through with him, we will have a great time together. The bad thing about this is that I almost don't allow myself to let anyone else in, because of the hope that something will pan out with us, although im thinking it probably never will. And since I dont know exactly what he is thinking, I feel like I cant just say to him whats going on? Because then if he is not thinking like I am, it will make things weird. Any advice on what to do? I just need some advice, since I have not told most of my friends how much I still care about this.