Just finished it now and im just confused and kinda annoyed (?)

Im annoyed at how Punpun actually gets a good life at the end. But isn't true? It's just funny how human this series actually is - everyone does deeply fucked up stuff but we just walk past it. I have read some other people's reviews and, including me, why does mostly everyone on start to think that Punpun is bad only until the very end of the series only for you to not even have the time to actually see Punpun as the antagonist and the series ended with Punpun just walking over it. Im baffled how he even starts to forget Aiko only in a matter of 2-3 years - but isn't that what we, as humans do anyways? I wonder how Punpun will end up in 20-30 years if the guilt gets him.

what i just wrote probably doesn't make much sense but i had to write something down to get some of my thoughts out. Anyone feels the same about Punpun/human nature?