Why would a guy not want you, but not want anyone else to have you?

I’m not good enough for him or else he would have wanted to be with me. I stop talking to him to maintain boundaries but he keeps coming around trying to be all romantic. I told him him straight up he has long standing issues with me 😂 anyways he uploaded a pic of him and some other guys one caught my eye so I asked him for his contacts and he got mad and I never got the dudes name or anything. I don’t get it, you don’t want me, have no intentions with me but God forbid I try to get in contact with someone I might get interested in. And he won’t leave me TF alone.

Why would a guy not want you, but not want anyone else to have you?
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