Should I just leave him alone or follow my heart?

In the past, my child's father has cheated on me countless of times. While we had arguments, he's sent me videos of him having sex with other women and he use to be mentally abusive. But now we're back together. I know he loves me. I can't see myself with no one else but my child's father. I've told my mom, sister, and best friend what he's done to me in the past and they don't like him. Now I'm hiding our relationship because my mom don't want me to be with him but I just want my family. Should I see if he's really changed for the better or just leave it alone. I don't know of people really change from cheating and abuse.

Edit: you guys was right. He got into it with my ex and told him we was back having sex. And went off on me so im officially done. Thanks for opening my eyes.