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I had one case of infidelity, didn't get me disfellowshipped as it wasn't on purpose. Wrong place, wrong time said the Elders.
I still felt guilty. So what to do? I apologized to the boyfriend of the woman involved (we're still friends) and I forgave myself. Took a while but I did it. Oh and I'm still friends with the woman as well.
I also apologized to God for my weakness.
Forgave myself and moved on.
I hope that is what you were asking..