There's enough red flags here to get out and to get out NOW. I would not analyze him OR his childhood trauma. What good will that do you? Point is, he has a violent past, he has been violent while he's been with you with other people. he is thinking violent/homicidal thoughts, and that's enough information for you to get away and to get away from him QUICKLY, LIKE NOW. This man is dangerous and could very well act on his fantasies. He is bad news!!!!!! LEAVE HIM ASAP is my advice!!!!!!!