You and mattheo used to date. Until people including him found out you were a mudblood. He broke up with you and you were left with no one. You got bullied and teased everyday. One day youre sitting by the blanket lake when youre attacked by random male students they hold you down and stab you several times and engrave into your chest "im a filthy mudblood" and they scrub dirt into the stab wounds and leave you there. Mattheo and his friends find you after they were looking for a place to hang out.