Gael: ... *He sobs in your arms* ...Thank you.
---
Poor Gael went insane due to his family's death, which left him all alone.

Unlike Ren, his apocolypse never came- he had never gotten his job. So he lived on the streets for most of his life, and 100 years later his family all died due to old age.
4 hundred years later, the grief finally got to him and he snapped.
He might be insane... But he's still a human.
This is also why he wants to find Ren. He envys his life.
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Enjoy!