Is there any way I can help my guy stop having commitment issues?

I dont want to buy into the thought that men with severe commitment issues cannot change and are only worth throwing to the curb and running from. There must be a way to fix this growing problem so we dont HAVE to dump the men we are deeply in love with! Is there anything I can do? Do I just need to stay this carefree girl I've been and hope that one day he admits his true feelings. We are exclusively intimate, but according to him we arent dating and according to BOTH of us, we arent screw buddies either. His idea of relationships are SO messed up and he is surrounded by fears from his past. He claims we are only friends but he has bi polar disorder too and he says one thing but does another. Before you think me a puppet, I'm NOT! I'm a very very strong independant woman with a very large heart whose fallen in love with a man who, (when he is away from the idiots that tear him down on a regular basis, we laugh ALL the time, joke around, wrestle, snuggle, hug, rub noses in that cutsie way.. etc.. but most of all he does make me SO happy on every level! Every other guy has tried to hurt me and I walked away cuz I saw their true colors. But this man I know on EVERY level after this many years and we have this connection that unmistakeable and unbreakable. So, that being said... How do I help him change this negative thought pattern he has going on? Help HIM be happier as well!