He doesn't turn me on anymore?!

I've been with my boyfriend for six months now and care about him a lot. I like him a lot but I don't get turned on that much anymore by him, the last time he made me climax was about 3 months ago. I still masturbate and think of him and then I can finish but I don't even get wet anymore with him, we have to use lube now. I used to be so sexually into him, I don't know what's wrong. I never want to have sex anymore and when we do, it doesn't feel that good so I have to pretend that I like it so he can finish. He loves it though and wants to do it every second. We've tried different positions, day, morning, night, nothing seems to be working. What should I do? I know it will crush him if I tell him