Not sexually attracted to BF

I love my bf romantically. Emotionally, etc. But the sexual attraction is not there. I'm never horny for him, I have a very hard time becoming wet enough for him. At first i thought it was because he was doing not the correct things, but I talked to him and he started doing the things i like and did them well, but for some reason I just can't get off. Its never has been a problem with other partners, just him. I find him attractive I just don't know what the problem is