Why do girls lead you on then reject you?

I really started to like this girl, she lead me on and on and on and onnn... I would flirt and she would continuously flirt back. Over half the time she started flirting with me and gave me numerous signs she liked me! Then when I asked her to homecoming she rejected me and says she doesn't like me.

I feel like sh*t and want to die. Why do you girls do this?
Why do girls lead you on then reject you?
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