Reasons you delete someone from Facebook?

This girl who is just a friend of mine has suddenly deleted me this morning and I have no idea why. We haven't had a fight or anything, in fact we were talking about her 18th birthday just yesterday!

I've tried to text her and she hasn't replied, I sent her a message on Facebook and still nothing. I know for a fact I've done nothing to upset her, this is just weird...

Girls, what are the reasons you delete someone because right now I'm 100% lost...
Reasons you delete someone from Facebook?
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