I'm pregnant and my libido has been blah . My bf legit gets mad at me if I don't want sex . For the most part I just give it

To him so I don't have to hear him bitch anymore . It's not fun and I dread it . It's either sex or an argument . It's changing the way I feel about him . I honestly don't want to be together anymore . I've tried talking to him about how it makes me feel pressured and he needs to be more understanding but he just doesn't get it . I'm 28 and he is 27 . Not to mention I get accused of cheating 24/7 , when I caught him cheating by getting naked pictures and inviting girls to my house while I'm at work to have sex 4 times just this year!! It's seriously dreadful to even see him everyday . Any advice ?