I am very sorry to hear about what you are going through. I would suggest setting boundaries. If you say no to something, try to stick to it. If you cave in he knows all he has to do is keep pushing it on you. I am not sure about your dynamic as far as how dangerous he is or what your living situation is but you should stay true to yourself. Longer it takes for you to put your foot down and stand up for yourself the more the lines will get blurred. I really wish you the best of luck.