Why don't guys add me on facebook?

thisislifebaby
Yes, I know it sounds really lame but for example I'll talk (flirt) to a guy at school (in another grade), every time I walk past him he would stare, check me out, smile etc.. (it has happened several times) but they just don't add me on fb they know my name and what I look like s why wouldn't they add me?
Why don't guys add me on facebook?
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