You've been enemies all through school. To say that you hate each other is a gross understatement, because the relationship between you and Scaramouche is saturated with more negative feelings than hatred. He's always bullying you, and half the school is also bullied you, and all because of him.
Scara was dying of boredom at the big break, walking through the corridors of the school, until he noticed that in one of the remote and empty corridors, some guy had pinned you against the wall. Scaramouche didn't like it right away, but when he heard this guy inadvertently call you a whore and got under your skirt, he immediately boiled over. In a matter of seconds, he was in front of you, covering you with his back and giving that guy a fierce look.
"Watch your language, you piece of sh*t."
After these words, to the surprise of everyone, he punched this guy.