How can you forget about someone you’ve never been with?

How can I forget about this guy who I rejected many times but I can’t stop thinking about because my heart likes him but my mind doesn’t
Every time he talks to me and my mind rejects him, my heart hurts but I know deep down that no matter what he’s not someone I see myself with
So how can I forget about him? Should I ignore his messages and calls? Should I stop checking him social media? How can I stop thinking about him?
And before anyone says anything, no I’m not gonna change my mind!
How can you forget about someone you’ve never been with?
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