Scared if Anal

If you read my last post I made it is about Not wanting to do anal… my Partner really wants to do Anal but I hate it so much and I’m so scared if it. I’m terrified to shit… I am scared to let him get near my butt or even touch my butt hole. I hate butt stuff and I hate the thought of it. It’s almost all he wants now. “ you will do what I say” when I say I don’t like it. We do have a Kink dynamic but I feel like when it comes to anal he doesn’t take no for an answer. I feel like not seeing him anymore and not talking to him because I just don’t want to argue about it. I don’t flipping understand why guys want anal so much ? It’s gross and nasty to me, and I refuse to do it. I need comforting in this situation.