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I don't think your stupid! Friends are forever! Go get your friend back, friends keep you sane... And it sounds like you guys were really good friends! This is the time to tell her how you feel (like it is dumb she calls herself a bitc.h) and hopefully she will tell you why she freaked out and deleted you... I have a feeling you guys will be friends again! :) Your 21 so if all else fails... go to her house and talk to her! :)

Good luck!