When something like this happens, you suddenly have no sense of reality at all. You have lost a piece of your past. The infidelity itself is small potatoes compared to the low-level brain damage that results when a whole chunk of your life turns out to have been completely different from what you thought it was. It becomes impossible to look back at anything that's happened. . . without wondering what was really going on.
I was almost put out of business by a well-meaning corpse.