Sex does not have to be equally satisfying to everyone involved all the time. Plenty of people have a 'my turn, your turn' approach where one person will do something with the expectation that they're going to be the one primarily getting pleasure another time.
But that needs the turn taking to be roughly equal, and this isn't, is it?
So what you want to find is a way of ensuring that it becomes closer to that. Doing it informally or via a record keeping system ('Oh, you're out of BJ tokens - you better earn some more by going down on me more often!') or... are all options.
Otherwise, you'll find yourself wondering why you're in a sexual relationship with him.