It is good that you don't talk to XH about S. He should work it out himself. As for him going off into the sunset happily ever after ... by the sounds of it, he hasn't changed much, and will probably dump OW shortly. If he doesn't, OW will soon find out what it's like to live with someone so selfish. But, in my opinion, you shouldn't worry about his life anymore. You should have fun now, maybe date some, but don't have too many expectations just yet. One day, a good man will come into your life, and you'll wonder why you were concerned.
Happy summer!
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