You have received some good suggestions here from Tainted and Doh. I too tend to be overly dependent when in a relationship. When my last relationship ended, and the one which brought me here to PC, I rec'd very good advice and honest feedback from many members here.
I decided to go back to school for my M.A. degree, focusing on that instead of wallowing in my own pain and loneliness. It has been 4 years of working on this degree, and I'm about to finish. Don't interpret this to mean I was all of a sudden "well" when I chose to do this...I was not! but having something positive on which to focus was sure better than continuing to obsess on being alone.
I think your boyfriend has been very supportive, but I also see where he is coming from, and you can't expect him to hang around if he feels overly burdened. Sorry if it sounds harsh saying this, but it is better to develop your own identity as an exciting female who is attractive to your mate.
I agree that counseling would be a good idea.
Patty