Obviously this man needs a little role reversal in order to appreciate what he has in you. Strap on a dildo and make him give you head, stimulate his prostate while calling him a whore, that sort of thing. You'd be surprised at the number of manly men who need this sort of thing.

THAT, or:

He's a complete misogynist. He wants to see you humiliated and used by other men. Become a COMPLETE subservient, it sounds like you're mostly there anyway, and service his friends while he watches. It is also surprising the number of men who like to watch their girlfriend/wife giving head to someone else. Personally, I would arrange the World's Largest Gang Bang for my girlfriend so long as I got to watch. I love to hate women and love women who need to be hated. It's the ultimate expression of loving subjection, and I get huge boners when I do things like have my gf shove dildos up her pussy on live cam chats while I read the comments of total strangers who don't know I'm her bf. Or have her take pictures of her fucking other dudes, then look at the pictures while she's sucking me off.

You know, good stuff.