I kissed my best friend's crush and I am confused about what to do?

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What happened was we were all drunk and I told her after each time we kissed but as the days go on my feelings grow and she's started messing around with him more. I just don't make the effort to see him because I don't want to hurt her.. She forgave the kissing and we promised not to let a guy come between us but he kinda is..
I kissed my best friend's crush and I am confused about what to do?
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