I’m not sexually attracted to my boyfriend?

My boyfriend and I have been dating for over 6 months now. our relationship lately, hasn’t been on the best of terms for our own personal reasons. we’ve been having a lot of problems lately but I’ve noticed that I don’t really want to have sex with him, I don’t always want to kiss him or just be nasty with him. (this is saying a lot because I can be REALLY nasty) it’s gotten so bad that I’m at the point where if I get horny, I think about someone else and not him :( I love my boyfriend with everything I’ve got, and I wanna be with him more than anything but I just don’t really want to have sex with him and I NEED dick in my life. I love having sex but not with him ?