My ex wants to have sex ?

My boyfriend broke up with me but then calls and says he wants to have sex w me. I told him absolutely not because we aren’t together anymore. He said “oh so you who are you going to have sex with now?” And obviously I said no one. He doesn’t want to be in a committed relationship with me but is willing to engage in sexual activity w me. What should I do? I want to say no because we aren’t in a relationship. What’s the point of having sex w someone if there’s no commitment with each other ? Wtf is his problem 😂 please help me and tell me what I should do.