I can not answer that as my WAW has never uttered those words since walking away. It seems you handled it well.
I had a similar event occur last March about 3 weeks after she moved out. She dropped me off at a car dealership to pick up my daughter's car. As I was getting out of the car she said 'when are we going to do something?', and then followed that up with a request of a kiss. Crazy stuff this MLC!
Me: 48 Ex-W: 45 M: Nov '96, together since Oct 93 Bomb: on 10-yr anni - Nov '06 OM Separated: mid-Feb '07 Divorced mid-July '08 One daughter - 28 XW living w/OM