Just a question, what triggered this? Finding that out might be the best place to start. You said he's saying it's cause of how his dad treated him. I'm guessing that was in his past. I could be wrong. If it was, something that happened more recently has triggered him to bring that back up to the point it's affecting his mood and actions. Might be worth trying to figure out what that trigger was. Maybe once you know what that was, you can then start helping him down the right path of dealing with it.

If you're truly concerned for your safety, you need to find a safe place. Even if it's just temporary. A friend, family, whatever. Take care of you first and foremost.

Hoping it works out!