Why is he being so persistent?

He is in a serious long-term relationship, but he keeps trying to pursue me. I’ve been very cold towards him. Ignored him. Been a bitch. Told him that I’m not interested in him. Blocked him on social media. Flirted with his friend in front of him. Now that I’m in a relationship, I’ve talked about my relationship and how I’m completely enamored with my boyfriend (so clearly I’m not interested).

I’ve pretty much done everything that would make any sane person lose interest. Why is he not giving up? Like go back to your girlfriend.
Why is he being so persistent?
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