Tough call. I think that you should go and focus on the children, not your W. You are going to have a nice afternoon with your kids. Let your W wonder what is going on in your head. At the same time, I think that it is perfectly fine to let yourself have fun. I just wouldn't bend over backwards to make this about you and your W. You don't want it to appear as if she is doing you a favor by inviting you.
It's a tough balancing act. I've been there. Plenty.
M 43 X 38 T 13 W moves out of home 11/2010 Roller coaster from hell 2/2011-5/2012 I request divorce 5/2012 W moves home 6/2012 Good time 7/2012 - 1/2015 I leave 3/2016 process of divorce