That is so sad! It demonstrates, again, how our families can effect how we end up as adults - if we let it. My FIL had many affairs during his M to my MIL, but she was the one that finally left with OW. She left while my H was away at camp. He was 12 years old, and came home to all the upheaval. MIL went to live in Germany with OW, for 2 years, before coming back to home country, apparently she missed her kids. Ha! H has one other younger brother with FIL, and 3 step-brothers from MIL's first M. FIL married a couple of years later to S-MIL (who was, initially, quite the wicked step-mother, until she became a born-again Christian, and is an absolute sweetheart now). My H has observed FIL having dinner, and going out with various OW during this second M. So, I am not terribly surprised that my H was able to convince himself that it was okay to do what he did.
My parents, on the other hand, were faithful to the end. Both passed away quite young - dad was 49, and mom 54. So, although they fought sometimes, I had that example of spousal loyalty. Grief! The things we do, and wonder why our kids turn out the way they do.
Me:57 H:52 M:28 Got another lawyer last year and filed. D35,S/D twins28,D22 EA4/04 End? Who knows? "Life is like a mirror. Smile at it and it smiles back at you." — Peace Pilgrim