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Well you gotta see it from his point of view. You know he's been beat down all his life. People have always said why can't you be more like your brother. They are twins so why isn't he good enough. He should be as smart as him. Since the beginning the dude has been raised as being not good enough or not as good at his brother. His own parent didn't even defend him. Yes his brother was there for him and tried to defend him, but he didn't understand him. His brother takes everything from him without trying. Especially the scene where he starts to fall in love, then his brother pops up and the attention he desperately seeks is on his brother............again.Eventually all the envy is going to come out. Was it wrong for what he did? Absolutely. But understandable.

Well the biggest threat for them is that bro ex-bf, idont care what happen to the brother, but his ex should die.

Doesn't excuse him being such a worthless human being. I've lived in my older sister's shadow my entire life and I'd be lying if I said most of the time I didn't envy her almost all the time she took the spotlight without even trying. And i hated it but not her never her. I would never ever think about doing to her what this evil brat did to his brother. He's disgusting.

I don´t think it´s understandble because he never said anything to his brother, he decided to hate him without even doing something. I think that the parents didn´t ignore him on purpuse because even when their suppossed "favourite" son was bullied to the point of wanting to die they didn´t notice so I think that they never notticed what was happening before either.