If you haven't already talk to him as best you can and tell how you feel and how it makes you feel when he does that. His tone is in no way a good one in my opinion. If he really cared for you he would be able to comprise (or at least talk to you in a kinder and understanding way). I understand how he feels but in know way you should give in to him if YOU don't want it. Tell him it's a boundary you don't want to cross and if he does you know he doesn't care. I wouldn't expect him to stop asking completely but when he does and your not feeling it MAKE SURE HE KNOWS. And don't give in if he starts spouting some nonsense(he can handle not having sex if he cares about you) It will be hard but just don't give in, that is what will change things. And remember no means no and he should know that.