Something like this... "Earlier today, you asked me about having lunch together or doing something this weekend. I decided that I'm not interested in doing those things with you at this point. If you want to reconcile our M, first we need to... (NC letter / transparency)"
Whoa! Nope. Zip it.
Sit back...observe and monitor.
I would encourage you to go to lunch with W and plan a weekend with her. This is critically important time for you and to W to work on your rebuilding.
Then use your EARS more than your mouth at lunch. Ok?