I have (had) two best friends and one of the them l went into business with. We'll call her Sarah. Anyway I found out that Sarah had betrayed our friendship very badly which ended our business together, (I have proof of this) Obviously l talked to my other friend about it and showed her the proof, she was horrified and said all the right things. Anyway fast forward a few months later and friend told me she had seen Sarah and actively went over as Sarah had her back to her and had a lovely little chat to her. I didn't say anything but was really hurt inwardly that she would do this after knowing what she did to me. Aibu to feel like this? I know Sarah didn't do anything to my other friend but still?