"Breakup" FWB

I'm in a situation where the FWB is no longer giving me what I want... What I mean by that is the circumstances have gone sour and he has said several hurtful things, including telling me I'm acting like a bitch for not sending him pics and videos one night. When I go silent he always posts videos of him out with girls, as if to make me jealous? We are no strings attached and not intimate AT ALL(were only purely sexual) but the other night he was out of town and "wanted me" (phone sex) I really couldn't at that time so he "threatened" that if u don't I'm gonna fuck this girl who is blowing up my phone. I said why would you choose phone sex over actual sex? Just fuck the girl. (I wasn't being sarcastic I was serious) He said he didn't want her he wanted me. But after another no is when he told me I was acting like a rude bitch. We made a couple rules at the beginning and one was to tell the other when we wanted to stop this. How do I go about it? Stopping this? (Yes I know he's an asshole)

EDIT : I'm feeling discouraged. Nobody has input?