advice please

I've had a really really tough pregnancy emotionally, and I need some advice or help to get through it. from the beginning my boyfriend (now ex) and I were fighting constantly. after having to block his whole family on everything, and multiple times of trying to work things out, his sister told me she wants him to try for full custody. im a student at a prestigious college, I live in a very stable home, the only way he could prove me unstable would be because of my anxiety. but it's so easy to get help for that. on my side, I have proof (his mom admitted to it in texts) that he use to leave bruises on me, and at one point he said "you obviously need this kid more than me, so I'll be okay with every other weekend". he only said he wanted to try for joint 2 weeks ago. which I've heard the court won't rule unless we are civil because we have to raise the child in similar ways.. I know I'm probably going to get full custody and in no way do I want to completely take my kid away from him, I just can't imagine why anyone would want to take the kid away from a stable mother? and also, I've considered abortion so I don't have to go through all of this. I desperately need advice. I'm on the verge of a breakdown and I'm not sure what else to do. thank you guys so much in advance. I won't be replying so I can stay anonymous.