What should i do? advice please!?

Me and my ex met about three yrs ago. We met at work. We started dating, everything was soo sweet! Eventually we moved in. He has a daughter and i have a daughter from another guy. When we moved in he started talking about how hurt he was that his ex cheated on him. Constantly. I told him he should be over it since he was starting a relationship w me. Then i found out he was texting and talking to a co worker. I was mad at, who wouldnt? So he left the house bc i was controlling him too much. By then i was three months pregnant alreasy. When he left i cried for him soo much. Like a month later he moved back in. In a week he was talking to his ex and left the house again. So when i was almost due he talked me into moving back w me. I accepted him again. When i was in labor he didnt hug me or anything. Instead he sat on the couch and was texting. Wtf ??? I broke up w him this time. Months later we mo ved back in w eachother. Now recently my daughter was diagnosed w epilepsy. And he walked out on us again! A week ago he came to see me and asked me to marry him. That he was sorry for everything. I still love him but have too many grudges against him. Advice please! Thnk u for taking ur time to read this.