I don't understand anymore what going on can someone explain why is he like that

The blue-haired guy is a dick, all the suffering the protagonist went through in his life since he met him is his fault, end of story.

Oh now I see was he always like this so obsessive I can see his acting like a dick now oh boy hope he was the fault of red hair parents

sorry about my mistake I mean to say I hope he wasn't the fault of red hair parents death