Shy girl gone cold on me? Urgent?

armanos1
Shy girl at school was showing signs of interest (body langauge and stuff) but now she's not doing the stuff she used to before. I've tried getting her number over Facebook which i think fucked me up. Formal's tomorrow night and she's going with a guy from school (the only guy who had the balls to ask her) i don't know if he'll ask her out though. I'm not great at approaching people and stuff so what should i do to get myself back in the game and in her head? what do you all think of the situation and what happened?
Shy girl gone cold on me? Urgent?
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