First love still loves me... so why won't he leave his girlfriend so we can try again?

Wow, some history between you two. Well, it seems that after all that you both went through, I say that he still likes you, his feelings are covered by his current girlfriend, so he tries to express some of those feelings to you, but they are invisible to you because you don't know what to do. Relax first, and start at the friend level, working your way up will help. It is tough for you huh? I say hang in there, he will come to you sooner than you think