[gambiter]

> what makes you the authority on how much pain they should have endured for their mistake?

And what makes YOU the authority to say they haven't endured enough pain? Or society, for that matter? If a couple 'went through a rough patch' and 'already moved past this', the one who was wronged was apparently forgiving. That forgiveness should be the end of it. We all make stupid decisions in our lives, but just because we did those things, we don't DESERVE endless consequences.

Your logic is a slippery slope to believing that rehabilitation is impossible. In which case, you're essentially arguing for immediate death (or at least shunning) to any wrongdoer, because how can any of us judge them to be rehabilitated?