Boyfriend doesn’t want me anymore

I feel like my boyfriend isn’t attracted to me anymore. We used to have sex all the time up until recently. He never wants to do anything even if I’m like rubbing up on him/giving him a blowjob. Even when he has a boner from me he doesn’t want to have sex and I don’t know if it’s cuz he’s not attracted to me anymore or he doesn’t like having sex with me or if there’s someone else he’s having sex with?

Update: I have talked to him about how I feel he said that he doesn’t know why I feel like this and that he does want me