My bf don't wanna have sex.

I think you might see topics like this coming up time to time but I do need some advice from strangers lol

We both not old we mid 20s and we just dating for 8 months so I don't understand why he don't what to. I ask him and he said it's just because he doesn't want it and I ask if it's because of me? Am I doing anything wrong? because I loss weight I trying to diet and do everything I can (I'm 5' tall 128 lb) he said nothing wrong with me.

Is anyone had been in this situation? Or anyone can help me? Anything..

This drive me crazy, we use to have sex 4 day a week and now either one or two a week we not living in together I'm only go see him on weekends. So I really don't understand what's going on. I never dating a guys this long before my last relationship was with girl and I dated her for 8 years.

Thank you for every advice or comment.