no U DONT GET IT im not justifying murder OK! but i think its kinda superficial to say it was just that. the guy is heavily traumatized, was completely isolated (sister dead by the times he kills brownie), and likley had nothing to live for. yeah he has major problem with jealously and inferiority complex but that is what makes his character so real, its like those problems of his were amplifed by his situation also those days he killed brownie (his bday) is literally the root of his trauma its those days he would especially be on the brink of snapping. that doesnt justify ever killing someone but brushing it off as something more minor completely undermines the writing of his character

So bro kill the brown haired guy because of jealousy and inferiority complex...ok