Sorry that you had to find out about this OM from your kid, that's just awful.
You are in the right mindset: be hopeful but be happy regardless what will happen. And above all, do right by your kids. And don't let W push you into not talking to the kids about your feelings...blaming W for things is probably bad, but talking about feelings isn't, they will need you through this and will need to know that you are open to them and they can talk to you about things.
Hang in there, hope the talk today goes well.
Me: 43 W: 41 Together 2009, Married 2011 Sons 10 and 6, Daughter 5 Bomb 2/21/21. W moved out 10/2021