Domestic Violence

Hello, my LO’s dad and I had a misunderstanding two days ago. He hit me, I asked him to leave or I would call the police. He left and haven’t heard from him since then. Before he left, I asked him to pay August rent but he refused. I am not sure what to do about this relationship. I can afford to pay August rent and will move out but I am really confused how someone can spend days and nights without thinking about his child. Any advise will be appreciated.