Why are some girls standoffish and rude around their crushes?

I just don't understand. Why would some girls be rude around people they like? Maybe they run away, avoid them or even act cold with single word answers but deep inside they're just supressing their feelings even though they really like them. It's just so destructive to yourself and YOUR CRUSH. Why do it?

Why are some girls standoffish and rude around their crushes?
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