Married and Pregnant

I'm married and my husband and I have 3 kids. We've been married 4 1/2 years but he left me for another girl. During our marriage, we would always fight and he would hit me and cheat and now he has another baby with her and I have one with someone else.

I still love him and want us to be a family and be there for his kids, but he plays games. He's with his new woman, but we have been together since he's been with her. She doesn't believe a thing I tell her. He's cheated on her plenty of times with me. I don't know what to do any more. HELP ME PLEASE.