Why girls say they can't find good guy, but reject good guys?

I have heard a lot of my girl friends complain about it.

I just heard that a girl who I used to like rejected me for a guy. The guy was 20cm shorter, really skinny, ugly face, and he cheated on her, while I would have been a 100% better boyfriend.

Why do they say they can't find a good guy, but aren't open when there is opportunity?

Why girls say they can't find good guy, but reject good guys?
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