Making the best of the mess.

[SteveLW]

They will deny even in the face of evidence. There are very few that just come in one day and admit they met someone, have been cheating, and are leaving to be with the OP. In fact, the very few couples that start their Rs in adultery and end up together long-term and married will usually change their "how we met" history to leave out the part about cheating on one or both of their spouses at the time. It is the way people rationalize things that are obviously morally bankrupt to themselves.