I know what you mean. I just started hanging out with one ex a few months ago, after not speaking for like four years. I think the only reason I did was because I felt like I had to prove that I was infinitely cooler and funner than I was when we dated. It's lame, but it worked. Especially since he's infinitely less of a jackass than he was when we were together. It's always nice to see that every once in awhile, people actually change for the better.
You poor thing. I'm sorry. I wish I knew what to say to help. But if he can't see what an amazing person you are, you're probably better off without him.
I hope you feel better.