It's a lot worse than this. MC goes through an entire arc of being bullied on a galactic scale. He's responsible for the atrocious deaths of many people close to him, and there's a good chance 6 billions people might die because of his betrayal. Even if it doesn't happen, MC will still have to live his entire life all alone, for being around people makes them forget all their memories. And when he finds the resolve to live this pathetic existence, not even being able to die, only comforted by his childhood friend remembering him and the love they shared for a short time, this shit happens, and it gets worse.