If he is still married, then he is not your boyfriend.
He is not free to be anyone's boyfriend until he is actually divorced. Not to mention the fact that he is stringing you a line of bull.
If he wanted to be divorced, he would be. If he's still living with his wife, then he still has a relationship with her. You only know what he's telling you - and I'd be willing to bet, at least half of it is lies.
Please have some respect for yourself as well as for all women, everywhere.
Break things off immediately and find someone who's available. This man is not yours to take and not yours to keep.