One of my friends told me that after her divorce, she would call XAH on their children's birthdays and say, "Just want to thank you for the most beautiful things we created in our marriage, and remind you that whatever else we did wrong, we will always have our boys. And I will always be grateful to you for that." He never responded. And it always hurt her terribly.
But she keeps making the calls, because she wants to.
I think you do what you do because you want to do it. Like Suki said -- not expecting a response. Hugs to you.