So beautifully done and so, so sad. Brian's acceptance that Justin would leave him, in the end, is painful and real for the character and you expressed that so well.

The ending was poignantly done:
He would let him go… and shove what was left into that box inside. And, in the end, it would just be like everything else there. Memories that sustained him.

It was enough.

It had to be. *sniffle*