I think she just likes the attention. For now, shes off limits. She has a bf, shes still with him....and shes blown you off outside of school many times. That alone should let you know she just thinks of you as a friend. She probably does not want to give you the wrong impression or lead you on any further by doing stuff with you outside of school. So, if you can handle it, be her friend. If not, then I guess your gonna be stuck with her over summer classes. But I wouldn't wait around for her.

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Appreciate the good times and learn from the bad times....