I just miss him😔

Sorry this is long. And I'm just venting... For a very long time now my boyfriend just never wants to have sex.. we have sex maybe 1-3 times a month, or sometimes like now we've gone a month without sex. I think now that I'm pregnant it's been even less... we only had sex once the month I got pregnant to. It seems he only has sex with me when he's drunk.. Anyways I've just tried to deal with it because our relationship is good besides that and I wouldn't throw away what we have because of that even though it's been hard to deal with. Well I'm 20 weeks pregnant and definitely showing, so as happy as I am I'm starting to become insecure. And it's not helping because he's been adding girls on social media that he's not suppose to even be having anything to do with(due to cheating in the beggining), girls that he doesn't know but are single and obviously pretty, and half/fully naked models. He just started doing this sometime last week. AndI'm extremely hurt by it. And obviously it doesn't help that I definitely don't look the same and he doesn't want to have sex with me as it is... I haven't said anything to him because I've tired talking to him about the no sex before and he just makes excuses,I know there's nothing wrong he's 26, he's not depressed,  and the girls we've fought over and over again so he knows what he's doing he just doesn't care... and I know I stayed around, but he hasn't been doing that(the thing with the girls) for a year and half and we moved past everything then one day he does it out of no where.. tonight I thought he was wanting to have sex he acted like he did, but ended up just turning over and going to bed... I'm just sad because we were doing the best we ever have been, and I just really miss being intimate with him😔 I just wish he'd make me feel wanted, and that he still loves me, and still thinks I'm attractive. I've done all I can and still have this issue. It also makes me sad that there's a few other guys that try to get with me knowing I'm pregnant and have seen pictures on social media of my belly, but my own boyfriend and the father of my child rarely touches me.. 💔