How do I break up with my babies father?

I’m 31 weeks pregnant right now. I’ve been with my babies father for 2 1/2 years. We got engaged a month before I got pregnant.

It was always kind of a very intense relationship but the last 2 and a half months have gotten bad. he never wants me around. He makes me go back and forth between his new house, which he initially said would be ours, and I’m lucky enough to be able to stay at my parents.

he screams at me and sometimes throws things.

when he wants me to leave he threatens to call the police if I don’t, and then he goes out and does whatever he feels like with his friends once I’m gone.

I’ve said that we needed to break up several times but we always just ended up back together and for the time being we were happy, but then the whole situation where he made me leave happens again. it’s happened 6 or 7 times now.

I need to break up with him but every time I’ve even brought it up, he somehow brings me back. and thats not just him, I do want to be with him. But it’s not good.

What can I say to get the point across that we can’t be together? It’s like he doesn’t believe me when I say it’s not working.. I don’t know what to do anymore.