Help me

So I’m 35 weeks pregnant and 20 yrs old mind u

So my sex drive is through the roof

Problem is my BF the dad (28 yrs old) isn’t . We’ve been together a little over 2 years

. The past month or two id say he just doesn’t initiate sex anymore or seem to want anything to do with it . I’ve asked him why and he said he just doesn’t know his sex drive just isn’t there .

I asked if he’s worried about hurting the baby or if it’s my body that’s throwing him off and he swears up and down that’s not it .

But I can’t help but feel like it is because I’m bigger and have this huge belly . Idk it’s starting to get to me

Every time I try to initiate he kind of just shuts me down or clearly isn’t into it. 😪 idk what to do . I’ve asked him if he’s stressed out at all but he says no . I just feel like he’s not telling me something no matter how much I try to talk to him . But if I push him to open up to me about what he’s really feeling he kind of gets mad that I “don’t believe him”

I don’t think he’s cheating but I feel like somethings wrong