I can tell you what worked for me. Wait for or create a space of time when he is calm and receptive to you. Tell him in the most loving way you can that you no longer love him, and, that you need to get some space between you. If he is the explosive type, make sure you are not alone. I dont know what your financial situation is, so, it is impossible to go further than what I just told you. If he insists that you stay, it is a good sign that he is sick. My ex told me she would rather cut my throat than see me leave. That is an example of sick. She also refused to seek council until it was way too late. That was 20 years ago, and the only regret I have is that I didn't do it sooner. I love being free.