Responses
I low-key think it's due to excessive drinking of alcohol, self starvation, bad diet & not eating healthy food (I'm js pointing out the obvious I'm crone ). Seeing how depressed he is, maybe he's also been having multiple nightmares about his past. I'm still not sure on what triggered it to happen..

is the last panels from present not past (the pictures of them together )...he have become skinny omg im doomed i shouldve let it marinate