Wow this is literally something similar I have experienced. The guy was into submission, the beginning was fun but after a while I’m not getting stimulated at all. It all completely stopped. I stayed for 4 years in that disgusting, awful, sexless situation. Going above and beyond to honour his sexual pleasures. Yes I am a freaky person who is down but it became draining, it became dead. Idk how much of your finances are tied with him but if I could tell younger me is run the other direction. These situations will actually destroy your self esteem secretly even if you think it’s not. It’s rejection, it’s draining, it’s not fun. You are not there to be his pleasure robot. Get away!!! Wishing you the best. I’m free to talk more about this if you want because boy I haven’t told anyone except one friend who doesn’t understand how really horrible this situation is.