Why wont he commit to me?

Could be any number of reasons - maybe he hasn't the capacity to trust, maybe he's just not that into you, maybe he has a dark evil secret and he doesn't want to lose you, maybe he's just got used to you but doesn't want to give any more of himself. No idea. If you're not satisfied, are you prepared to lose what you have to address it? If you move on you're opening a space for someone else to fill (maybe more suitable, maybe not, maybe no one at all?), if you accept things as they are, then you accept things as they are. Good luck.