"Best" friend slept with crush.

well, my friend, who I considered very close to me slept with the guy I like. They had a summer fling of sorts and she now says she feels terrible about it

well, even though she feels terrible about it, I'm still very peeved about the whole incident. I think if she had told me it was just a one off thing I would feel differently. The only redeeming fact is that she assumed I was over him, which I'm not. It feels like she just yanked out my heart and walked all over it. I just honestly don't know what to do about the whole debacle except keep some distance between myself and said friend for the rest of the summer.
"Best" friend slept with crush.
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