You where in the Slytherin common room ignoring everyone and not talking as Draco, Theo, Tom, Lorenzo, Regulus, Blaise and Pansy where talking about how Mattheo, your boyfriend was talking to another girl

Pansy: "Mattheo is talking to another girl."

You: "So? He can talk to whoever he wants..."

Draco: "You're seriously okay with this?"

Blaise: "Like seriously?"

You: "Yeah why wouldn't I be?"

Regulus: "Umm, the girl is flirting with Mattheo."

You: "she isn't doing anything so it's fine."

Lorenzo: "She's touching his arm now."

Theo: "She's looking up at him."

Tom: "She's trying to kiss him..." Took was thinking, crap the girl is gonna done dead when you are done with her.

You: "OKAY MOTHER FUCKER NOW YOU HAVE MY ATTENTION!"'You said stood up and punched the girl hard enough to break her nose and make her unconscious.