Very unhappy. Just wanna give up

I don't know what to do guys so I'm coming to you all. My boyfriend makes me feel so unloved now that I'm pregnant he constantly reminds me that everything that happens in his life is my fault he acts so distant when I mention our child I'll send him something like a name or a outfit and he'll just say he doesn't care the only time he's nice is when he wants head (which is Damn near every night cuz I don't want to have sex & because I Dont want sex it's because I want someone else) or when he wants me to clean other than that I'm pretty much ridiculed and made to feel worthless any other time. I have the worst morning sickness and fatigue and that supposedly only happens when he's around which is untrue. & I'll put it out and I'm not happy about it but I smoke cigarettes I try quitting so bad actually the hardest to my capabilities but I have no support I raise 4 kids 2 are mine 2 are his and I pretty much do this on my own he won't work and I can't because any time I get a job I'm flirting with other guys and cheating and it just makes everything in our lives worse so why even bother, like things aren't rough enough now I constantly stress over moving and bills and money and simple household items that we can't afford because I can't work I feel like my child is going to have nothing and I'm going to end up depending on welfare my 2 kids are actually twins and when I was pregnant with them I was also depressed I had nothing literally no house no clothes no bottles no pacifier I was 17 and on my own with nothing and no one now I've been with him 4 years and thought if we ever had a child it was going to be different I wouldn't be sad and depressed and lonely he literally saved me and gave me everything and now I feel lonelier than ever and that I'm still on my own because I wouldn't even have a place to live of it wasn't for him, which I'm constantly reminded of. I feel stuck and in a slump I was already diagnosed with major depressive disorder (clinical depression in other words) before I got pregnant now I feel like it's just taking a hold of me I'm getting to where leaving my bed feels like I'm dying and not getting out of bed makes me feel like shit I want to cry all the time idk what to do it's just consuming me. I'm so lost someone please help me point me in some sort of direction. I'm close to giving up.