Draco (your boyfriend) knew about your abusive Ex but he didn't know that your ex came to Hogwarts somehow and was bothering you andyou were more clingy and quiet than usual and one day he heard yelling and quiet crying from your dorm room as he opened the door he saw your crying while putting your arms up to protect yourself as you Ex screamed at you for being pathetic and not paying any attention to him as he kept kicking and slapping you and Draco's eyes widened as he boiled with rage