But think about the pain that Luke feels when he hears Valentine call him Parabatai.
They committed themselves to each other in a way few do, parabatais after all are not a common thing.
Think about it you’re just a child and you’re dedicating yourself to this person. Not only to fight alongside them, but to protect those they love, to follow wherever they may go, to lay beside them in death both literally and figuratively.
You feel their life, it’s buzzing underneath you like the blood pulsing through your very own veins.
Luke genuinely loved Valentine. Thought him to be something greater than life, an inspiration. Luke followed him everywhere even if sometimes he questioned him. And Valentine broke him. He manipulated and twisted their bond and took everything Luke loved away from him, his status, his family, his career.
And you know what’s sad? I don’t think Luke ever stopped loving Valentine in those 18 years. As we see him tell Clary he blames himself for not being able to protect his Parabatai, considers himself selfish and I think he hopes that maybe somewhere there’s still a shred of Val. After all 18 years later he’s the only person who still refers to Valentine as Val.
And now Valentine’s finally gone to far. He killed Jocelyn. He’ll kill Clary to if that’s what has to be done. And Luke finally can’t bear it. In this episode we see Luke for the first time in his life destroy the bonds that still connected him to Valentine.
He’s no longer his parabatai