Why do people think that they're entitled to a friendship after they reject you?

I've had guys reject me only to become obsessive/borderline stalkers when I
discontinue the friendship because we aren't on the same page.

I'm still polite and cordial around them, but they complain that I don't act the same way around them and not as engaging.

By the way, it’s not like these guys don’t have friends or a support system.
Why do people think that they're entitled to a friendship after they reject you?
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