annoying girl keeps talking to me on facebook?

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Hi there!
I used to be in a similar situation to you. From reading your answer i can see you're both probably still in high school?
if shes bothering you that much, tell her. She obviously doesn't realize she's doing anything wrong.
The worst thing you could do is talk about it to your other friends, because rumours can be spread really easily and imagine how hurt she would feel if she thinks everyone is talking about her, especially the people she trusts with stuff about boys, the people who she thinks she's friends with.
if she keeps talking to you on facebook and wont leave you alone there is an option to turn your online status off for certain people, so perhaps you could try that.
just tell her you want some time apart from other, otherwise she'll probably keep talking to you, and not knowing what she's done wrong!
Hope this helps

xx