Treese, The ow doesn't care what your plan is. All she is caring about is the money that your h is bringing in and she can spend and play to her heart's content. All they want is fun, fun, and more fun. His responsibilities are his and she could care less about them, just as long as he's there with her, even in body, not in mind. They just don't care what they've done or how they did it.
BTW, you are correct in stating that they affair down. My xh's ow will never see 110 again, more like 150 now at 5ft. Oh, you'll die laughing at this one...someone saw her photo on Facebook and told me that her hair is no longer black....it is now the color of mine...strawberry blonde and it's cut the way that use to wear my hair back in the late 70's. Gee, I should be flattered that she wants to look like me! She's pathetic and unbecoming as well. Very childish and immature in what she does w/her life. Oh, well...the sand will soon run out of that sand box.
They are all just plain nuts, if you ask me.
Take care of you and your children and I wouldn't do mediation either.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.