This is nonconsensual sex. It would be another thing altogether if you had discussed it and it turned you on. But you told him no, that you don't like this and don't want it. If you feel you need to try to save this, I'd suggest one last Very Clear conversation and that he needs to get counseling. This is not appropriate or normal. As a male friend once put it (we were discussing a news story about date rape drug) very sarcastically, "just what a real man wants, sex with a totally unresponsive woman". Look at how many men are here asking how to help the woman in their life be more responsive.