In a straight relationship but starting to realize sexuality

I have this boyfriend and we've been dating for a while, and I think that I love him. At least, that's what I say to him, but I'm starting to realize that I can't picture a future with him or even anything sexual with him. I don't even like kissing him, to be completely honest. This has been one of the best relationships that I've had in a while, and I don't want to just throw it away, however I can't tell if the love I do feel for him is platonic or romantic. I can't picture a future for myself with any male, not just him. And when I think about things with girls, it's a lot more appealing. I have dated girls before but the relationships ended and I'm craving that again and I don't know how to tell him that I think I might be gay, or at least have a preference for girls without completely destroying him. He means so much to me but I don't know how much more than a friend I see him as and just don't know where to go from here. Please help and thank you for reading.

The truth hurts. Sometimes at least. Lieing to him intentionally like now is worse tho. Congratulations on coming out tho.