I do understand what you mean about this having no closure.
And I know that you want to keep things "up" for your son. I did the same thing. Until my son told me not to. He said, Mom, I know this is hard and we are going to feel sad. You don't have to try to make everything perfect for me. I just have to deal with it and get through it because that's the way it is. Special boy, my son. And correct.
I also learned that its ok for them to see us sad or upset. That's a hard one for me, but an important one.