Bad baby daddy

I broke up with my boyfriend, blocked him on everything, truly had no intention of speaking to him ever again. Bc I found out he was cheating on me. Days after I broke up with him I found out I was pregnant. Unblocked him just to tell him. He was so happy said he wants to be a family do everything right clean up his act etc. Now just three days later he’s back at his ex’s house that he was playing me with. Sleeping with her. I want to block him again and move forward in this without him involved.. but I know at the end of the day he is the baby‘s father. He will want to be involved even if it’s just seeing baby every now and then once they’re born. But he is just such a bad person. Mind you he already has three kids that he doesn’t see. I’m just so hurt. This is my first baby and this isn’t how I wanted this to be. I plan to move back home to be with my family I will have all the support I need there. I just don’t know how I’m supposed to act down the road when he begs to be involved. He won’t be a good example to my child. Not even just about how to treat a woman, but how to be a man. 31 with no job, technically homeless, involved in gang activity, drugs, etc. But I knew all this when I chose to lay down with him. So he says I don’t have the right to keep his kid from him regardless. The same thing he says about his other baby mamas that won’t let him come around. He says they knew who he was when they chose to have sex w him so they don’t have the right to block him out once a baby is made. I guess I’m just venting. I feel horrible.