[The words might have broken down, but Homura understands the pain in Goku's sobs. The boy's cries resound with a deep loss, echoing Homura's own emotions. While Goku's youth and innocence allow him to cry openly, Homura remains restrained. In part is for Goku himself, so the boy doesn't pick up on any pain more than what he already feels. He knows all too well how sensitive the child is, how kind the heart that lets him regret killing a mortal foe centuries into the future.

But the simple truth of it is that Homura is tired from his own ordeal, too much to endure the fulll effects of the revelation.]

I am sorry, Son Goku.