Horrible relationship but now I'm pregnant.

I am in a relationship a pretty toxic relationship, that I still very much wish was fixable (not because I'm pregnant). I've cheated and been caught (oh well I owned up to it this was years ago) he used to bring it up like once every other day, and NEVER let it go. Then I found out recently that HE had been trying to have sex with some girl, had sex with another girl, found condoms in his room, texts from other girls. Now that I'm pregnant EVERY SINGLE DAY he's accusing me of cheating, or blaming me for something that happened a year ago, blocking my number; texting other girls. (Though so badly I want to work this out I've gone to therapy, I've changed my attitude) i want to be with him and we have been together for nearly 4 years, I'm nauseas all the time from the fighting,stressed because even if he breaks up with me I can't do anything that would upset him.

I just want to end it and walk away but now I'm tied with this baby I'm already a single mother to one child and I just don't want to have another child with no father, I have no help from family of my own, I have no friends and I do not know if I could make it on my own with two kids.

I just need to know how to end this when I still have to talk to Him from time to time about the baby

I know this is scattered but we have just gone through another fight and I just can't take it