Dear LW, I am glad you landed the new job and are living up to the challenges it presents. God only knows how fragile our emotional state is but a change as significant as this is cathartic in my opinion. It offers a platform to invest yourself mentally. I am also happy to hear of your S's successes. I am not just a new DBer, as you know I am relatively an inexperienced parent as well. My oldest is only 3.5 so I have so much to experience and learn in that realm.
On reading your post I asked myself what I should do if there is something about my D that makes me proud, the answer was I should share it with her other parent. Mind you, I am not doing that at all right now, I am acting like he should lose out on all such moments as well because it was his decision to leave the family. But I think I have to work on changing that on my side, he wronged me but he still is the father of my precious Ds. I should not punish him by taking away from the moments of happiness that our children will provide. He deserves that experience too.
I will let the other more experienced parents weigh in on if you should have included your WAW in your S's performance. At that age I am not sure if you should ask him to open his heart to his mother so she can experience the joy of seeing him shine too. Maybe that will show him that you are yourself opening your heart and showing forgiveness.
But I thank you for sharing this and letting me apply this to my own sitch, I should work on being a better co-parent.
Have a wonderful weekend and celebrate your Ss success, hugs.