Thanks so much for the advice, AinO! I hope I can follow it; I know I intend to.
I have no doubt that it will fall apart with his OW. I honestly am not even interested. There's about a snowball's chance in Hell that she can compete with me in the long run, and if he need sot be with her to figure things out, I can't begrudge that.
And good luck in your sitch, AinO. I feel for you, and I know that your sitch is really draining. I'm sorry if i gave you some bad advice. Follow your gut and you'll come out smelling like roses regardless of the final outcome.