You just don't know what W is talking about until she brings up whatever isn't "fun to discuss." Assuming it might be about the OM, just be prepared to re-state your stance about not being a willing participant in a marriage with the third party.
As you well know by now, it isn't always another nail the coffin.
Be sure to get the times so you can make GAL plans. This will tell W that she has a short-time frame and work within that parameter. In a way, it will protect you from having hours-long discussion by going in circles.
If W wants time away, so be it. Just make sure she doesn't take away your vacation time with the kiddos. It is YOUR time with them!
