How to tell girl is cheating?

well..trust me you will know when she is.(: actually...she will probably keep her distance or when you make plans she will avoid them or go and leave early and "miss ur calls or texts". good luck(:

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If you love her, then you trust her. And if you don't trust her, then you don't love her. And if you don't love her, what difference does it make whether or not she is cheating on you? Just go find someone else.