Because I tried to stop him from walking away when we're bonded together. His reasoning is that I should experience pain, as if I didn't grow up with it. (And yes, I'm rolling my eyes at the moment)
In my school, students are divided by 'houses'. Gryffindor is one of them. Supposedly is the house of the brave, but usually it's the house of the arrogant and self-righteous, who think that everything they do is justified.