Losing sexual desire for him

I’ve been with my bf for a little over 3 years and I love him so much I am attracted to him but not sexual, Everything was great in the beginning but I honestly haven’t had an orgasim in a while,idk if that’s the reason I don’t feel in the mood anymore to have sex or if it’s cause of my birth control. Can anybody help me with this cause I’ll have sex with him but then I’ll loose interest and feel myself get dry. I just want it to be like the beginning when I would actually want to have sex and it’ll feel good..😕