Oral sex orgasm help!

My bf doesn't like to go down on me, but he's such a sweetheart that he does it only to make me happy. I feel bad for him that i have to ask him to do that every other day as that's the only way for me to orgasm. What do I do, i don't want to make him do something he doesn't like, I really don't want to be selfish, but there is no other way I can orgasm. And I love him way too much to move on, been together for 4 years but still trying to figure this problem out. Also tried doing it with his hands, but didn't help either.