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well since it sounds like you guys have a history, she probaly has moved on. has she dated other guys? does she like other guys? if so then difinetly. well first of all never ever date an ex's bff even if she said it was ok, it wasnt, so go ahead and kick yourself for that move. if u guys dated on and off then its probaly means that she liked u but not as a bf type and the relationship wasnt one meant to last. chances r she doesnt like you, try to get over her, pick someone else but remains friends with her. if u like her then its a feeling that wont go away until some time so im sure ur guys friendship means a lot to her but just remain friends and try to get over her she probaly doesnt like u in that way. sorry kid, and good luck:)

idk what u should do because you should never date your ex's best friend;)♥