Are you dense?? Didn't you just hear what 25 said about going to S11's games to CHEER and SUPPORT him? It is all about your son.
I can tell you what will happen if you don't show up:
-S11 will be crushed -S11 will feel less than good because he will know the real reason that you didn't show up -S11 will feel caught in the middle of his so-called warring parents because they can't get their chit together -W will view you in a very negative light instead of a confident man who's getting on with his life
And continuing to ignore W's texts is just more of the same petulant behavior.
You're wrong think that you're telegraphing to W that you are okay with this separation. She already knows through your angry responses.