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Abandon his friends Harry and Hermione when they hunt for Horcruxes
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Being jealous of Harry being selected a Triwizard champion
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Stealing his father's flying Ford Anglia to go to Hogwarts
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Breaking his first wand trying to control the car
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Having a relationship with Lavender Brown
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Had a fight with Hermione for being with Viktor Krum at the Yule Ball
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Not bothering to dance with Padma Patil at the Yule Ball
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Making Hermione cry in their first year
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Letting Draco Malfoy's insults get to him
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Blaming Hermione's cat for attacking Scabbers