Boyfriend issues

My boyfriend and I have been together for a year and a half, we fight/argue at least 4 times a week. Usually it's stupid stuff, but it always gets way too escalated. Nowadays he's constantly accusing me of talking to someone else (I don't want to get any comments about how people do that when they're actually doing it, please) I know we don't have a really healthy relationship, but I can't bring myself to break up with him. I've thought about it so many times, but the words never can come out. I feel trapped. I have depression on top of all this so it makes it worse, and he doesn't understand what it's like so I can't talk to him about it. I'm currently 17w+6d pregnant. I grew up with my parents being divorced, and I really don't want my baby to go through that, but I can't take it anymore. I'm just looking for some advice right now i guess on how to get through this. Thanks in advance

Edit: we also live together with my mom, which I feel would make breaking up more difficult/complicated?