hmm maybe its a few things...ive been like your freind myself, when i had various confidence issues n stuffs..nd i couldnt look the person in the face and stoof..because they too were the only person tht knew my feelings, nd i dnt know..this kind of embarresed me .. although i was very grateful too her ...and could just be it hurts her too much that shes leaving and shell miss you bad like boing said...so maybe it's just something like this, with your freind also? just have a little chat with her about it, im sure its nothing on purpose or your fault