Why do some girls who crushes on a boy, lose interest after the boy shows attraction/interest?

Anonymous
I've noticed a character trait with several women and that's that some women will lose interest after the guy likes them. I believe it could be something to do with self-esteem or self-hatred issues. Not sure. Why would a woman who has a crush on a guy lose interest after any hints of interest?
Why do some girls who crushes on a boy, lose interest after the boy shows attraction/interest?
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