Why did my crush unfriend me on Facebook?

Migix
I dont get it! i try not to bug her and she doesn't seem bugged so thats out of the question but i just dont get it. i didn't even tell her i have a crush on her! I said "Hey" and the message marked "seen". then a few minutes later i say "R you there?" but this time it's not seen. i go to her Facebook page and instead of saying "friends" it tells me to send a friend request. What could have been the cause of this?
Why did my crush unfriend me on Facebook?
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