"I'm trying very hard not to have any hopes or expectations - live in the reality I'm in."
So.. what you are saying is that you have no hopes.. or expectations?
This does not seem like a good place to be.
What do you hope for?
What if I told you that you could not have the marriage you want?
"He told me today that before flying to Vegas to help my H break our marriage vows, OW was "100% certain" that she was in love with H - he was her soul mate.
Today, OW told her H that she's "just not sure how she feels" and "she's not sure she loves him" and that she doesn't want to seek a divorce from him right now."
So.. you like the Drama? I "see" you running in to get some.
Does it make you feel safe?
"It's non-productive, but I can't always stop my mind from going down various paths and examining different scenarios."
You can stop your mind. You are just not "focusing" on the right things.
I am 100% sure that I have told you to prepare. I will assure you that in preparing you will not be talking to OWH. It is just dirt.. and the more you roll in it.. the more dirty you will get.
Relax Eat Think Act normal React.. Smartly. Do something different. Emulate. Do Work.