Most Helpful Guy
It would be better if the guy or gal keeps quiet about it. If it happened once and the guilty party realizes it was a mistake and never does it again, he or she should just be quiet about it. Of course, it violates the integrity of the relationship, but revealing the truth will not solve the issue. The reason why people tell their partners of their mistakes because they don't want to live with the guilt. However, I believe that the guilty party should live with the guilt. Anyway, to answer your question, you should establish the rules of the relationship. If you and your partner are happy with being open, then that's fine, as long as both parties know.
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