I'm not going to pretend that young relationships are meaningless, because they aren't. I have two close friends who started dating in the 8th grade, and are now married. Ya never really know how it'll turn out.
Still, just wait a few days and see what happens. If she's nice to you tomorrow, maybe she was giving your friend the bird. (Of course the two of them must have some issues to work out, then.)
But really though.
If she's always flirting with other guys,
is she really worth your time?
Just something to think about, but I wish you luck hun.
