Why do girls flirt with guys they have no intention of doing anything with?

I'm tired of falling for it, tired of thinking someone cares about me or finds me attractive or interesting just for it mean nothing, it always means nothing yet my stupid ass always Hope's it does.
So sure part of the problem is I'm a hopeless moron that is borderline self sabatoshing by allowing myself to think for even a second it means anything.
But girls, why do flirt so casually and with guys that mean absolutely nothing to you? I dont think I've ever flirted with a girl I didn't like somewhat.
If flirting is just casual and dosent matter what does? What should I look for? I just want to feel like I matter to someone, I want someone to care. I'm tired of all this fake dating game bs.
Why do girls flirt with guys they have no intention of doing anything with?
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