I see in your bio info you refer to this man as your fiancé but only as your boyfriend in your post. Second thoughts? Hope so!

The fact that you keep your composure at age 16 in the face of such outrageous behaviour tells me you know how dangerous he is, how very dangerous he is capable of being. So your question, "what do I do," is rhetorical. You know what to do, Mordecaii.

Pack your rat & your stuff and go to a Women's Shelter. Don't discuss anything with him beforehand.