Run away fast. This constitutes stalking, you need a restraining order on him. Otherwise there is no way of knowing what he will do next! He already said “ you don’t know what I’m capable of!” I would believe that! He’s making excuses for his behavior. I wouldn’t believe a word that comes out of his mouth. This is a very dangerous situation to be in. Not just for you but for your family. I’m sorry to give you such bad news, but I don’t think he’s safe to be around.