Why do women get angry when 'nice guys' reject them?

Anonymous
I keep getting told I'm a nice guy and I think I am.

But I also get told that a truly nice guy doesn't want or expect any reward from women. So why do women get angry when nice guys reject them? I have rejected a few women in my life and they have all gotten angry. Why?
Why do women get angry when 'nice guys' reject them?
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