Non existent sex drive..

It’s been about 2 months since my boyfriend and i have had sex.. I’m not his first partner but he is my first.. we’ve been together 3 and a half years. We used to do it pretty frequently when we first got together but now we rarely do it. He says we don’t because I don’t want to and because I’m not comfortable with my body. I feel very empty towards it, no feelings. Even when I think about doing it I feel nothing... Can someone help me with this please..? I really could use it..