I'm Worried About My Friend And His Mental Health. He

I'm worried about my friend and his mental health. He has dreams of fighting people and craves raw flesh and restrains from killing animals. He is obsessed with something he created called fallen and even brought me into it. He can get clingy and he relies on his girlfriend to keep him together. He always tells me if something happened to his girlfriend he will go rogue and might hurt people and I'm scared about what might happen. He has had doctors and pychiatrists in the past and they don't know what's wrong either. He has gotten a CAT scan and I believe he told me he had a lot of neurons in his brain. I want to say he's a sociopath but he's very social and had normal feelings. He also has very high senses like hearing, smell, sight, and can read emotions very well.He sees everyone as humans and people he is close to people. I am honestly worried about him.