How do I discourage this guy?

There’s this guy who my therapist helped me to understand is trying to bully me into a relationship, by negging me, making nasty comments about my long distance relationships and just hanging around online and in person. I’ve tried being polite but firm, I’ve tried being brutally honest, I’ve tried being kind, I’ve tried ignoring him and I’ve tried grey rocking him. Nothing works. He says he’s not single but I think he just said that to make me jealous, as he’s always trying to contact me. What’s it going to take to stop him? Any ideas?

How do I discourage this guy?
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