What does it mean when your crush delete your friend request in facebook?

Please i need help , this girl i like , i', m sure she has a big crush for me , she is very shy , we talked 2 times and she always seem nervous and doesn't know what to do when she is around me , i said maybe when i send her a friend request she will not be nervous and can talk without stress , but she deleted it why?
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Help me please
What does it mean when your crush delete your friend request in facebook?
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