It does not matter what she did while they were broken up! Just tell him that she had no idea that they were going to get back together. I highly doubt he never seen anyone during the split. She just needs to tell him that she is sorry about what she did and if they truly love each other they can find away to get over the past. It is in the past, it doesn't matter anymore. What matters is the future between the two of them. And if he is still talking to your friend, than he still wants to be with her.
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