What does an implied so there look like: raise eyebrows slightly, tilt head slightly to one side and back again...:P
Seriously though, it is so great that you are working on these interactions. My H is very much like you and his pattern his whole life has been just to get away, jettison everything and start again- like not acknowledging things makes them go away. So, he has never learned to deal effectively with these parts of his personality. I am glad you are
Tell S truth: sounds totally amazing, but there is so much in our lives right now, that we could not commit to one more activity. Give her a hug and tell her you love her for thinking of your boys.