Your S will truly be a guiding light for you and you can take solace in the fact that your relationship with him is fantastic. Good job!
After reading your thread, the thing that jumps out at me, probably because I'm guilty of it too, is assuming what she is doing with her time, and worrying a bit about the OM. I noticed you judging whether she saw him after mass and how that was inappropriate. Unfortunately, you need to not worry about that. We have no control over the OM and our WAW R.
I have the same concerns and fears with you re friend zone. Unfortunately I am currently in the A hole husband zone
Be consistent as you are doing, have really zero expectations, and keep GAL. Detachment is not going to be easy. Don't be too hard on yourself. You've been together 24 years, you can't switch that off immediately
Also, I noticed lots of focus on the mediation meeting and how things turned from that point. Was there anything else that happened at that point? I'm sure your W is concerned about the finances, as you should be. I think you've handled yourself very well. It's a tightrope act, that required delicate balancing. That balance is much easier when you are balancing for you, not someone else.