J.k. Rowling said this quote

“ Ron seems to be enjoying the celebrations.” said Hermione. “Don’t pretend you didn’t see him. He wasn’t exactly hiding it, was — ?”The door behind them burst open. To Harry’s horror, Ron came in, laughing, pulling Lavender by the hand. “Oh,” he said, drawing up short at the sight of Harry and Hermione.“Oops!” said Lavender, and she backed out of the room, giggling.There was a horrible, swelling, billowing silence. Hermione was staring at Ron, who refused to look at her. She walked very slowly and erectly toward the door. Harry glanced at Ron, who was looking relieved that nothing worse had hap ”