Husband doesn't want sex?

I married my husband last September and am now 7 months pregnant. He's never really had a high sex drive but it's gotten worse. We only had sex when I initiated it and then it was in and out with no foreplay and he didn't seem to mind I was left unsatusfied. I stopped initiating it in hopes he would come onto me but that backfired because now we just don't do it. It has cause alot of fights and he blames our strained relationship for turning him off to sex, even said he is now A-sexual. In anger last night he said he felt when I initiated sex I was just power hungry and he felt forced, even said I forced him to perform oral sex. If I don't initiate sex, we don't do it, when I do, I'm forcing him and he does it out of pity. I'm so sad and frustrated, what do I do?