He can't live with knowing the future and not being able to save anyone.

“I am trash and shit and crazy to you and this whole fucking world. You don't ca…”

“The moment the world declares a person to be immortal, at that moment the perso…”

“We all die. The goal isn't to live forever, the goal is to create something tha…”

“The truth is, Archer tells me, you stay in Hell until you forgive yourself. "Yo…”