Bf does not want sex

What does it mean if my boyfriend doesn't want to have sex? We were cuddling and I asked him if he wanted to like, some time in the near future and he pretty much said no. When I asked why, he said "can't you just enjoy this?" meaning the cuddling. And then I said "I'm just trying to understand, talk to me" and he said "Just forget about it, babe." I don't think it's the pregnancy because we had sex a few times a couple months ago. It makes me feel like he isn't attracted to me anymore.