That scenario could have been written about my parents split.
A two year affair leading to the break up of my parents 25yr marriage and OW's 15 Yr marriage.
Yes my mum was devasted, betrayed, humiliated and still seethe about it 20 odd years later.
My father and now step mum are, however, perfect together. She is a pleasant, caring , generous woman.
My father apparently was not happy for a long time before the affair and looking back I can see that. My mother is in complete denial and insists they would still be blissfully married if it wasn't for OW, and it's that kind of refusal to see the truth that probably was the problem all along.
Affairs are indeed not always all about shagging and thrill seeking. When you are in an unhappy relationship and feel trapped and powerless, it's easy to see how they start.
These women taking revenge are obviously nasty pieces of work and not very bright. I hope the mum is ashamed now.