I don't that should not be a boundary, but really, only you can decide that for yourself.
I would suggest, if you haven't already, reading DR & DB. If you have, read them again and start acting 'as-if' you are ready to move on with your life with or without her and GAL!!!. But be cordial, friendly and loving when dealing with your W.
It's not easy, and it's not fun - at first. But it IS necessary, and eventually you really WILL get to that point. And everyone else id right about friends and family - great for idle chit-cat, not so much for R talk. They will all have a bias, and while that may be good for initial support, it's not so great for DB'ing.
I've found myself numerous times asking myself why I said this or that to a friend, after all they did was trash my W. That wasn't what I was looking for - an impartial opinion is what I was looking for...
