I would keep short and simple. Cordial and Civil. If she brings it up, don't acknowledge it and leave as soon as you can. It doesn't matter and you are not her backup, you deserve to be treated with respect.
Keep up the prayer and being a better version of yourself..
I will keep you in my prayers my brother.
Thank you EMMess, were on the same boat, thank you for being there for me as I am for you, it stings as I type this and has been very painful, just when I think I have overcome this Im back to square 1.
FULLY Detach 180s. PMA Be the best ILYNOT Continue to pray for Her to open her eyes to the painful realities of separation and divorce. Move on.