You were close to Izuku and Katsuki, so it was inevitable that you would also find out about his secret, that he was All Might's heir and had obtained his quirk through him. That same day you found out, you made a promise in front of them and Yagi, swearing never to tell the secret no matter the circumstance, but you couldn't fully keep this promise.
In a failed mission, you ended up being kidnapped by the LOV, who tried to get information about All Might and Izuku out of you in a "good way" at first, refusing you despite the blows and comments. But as soon as AFO arrived, everything went down the drain. You were tortured in unimaginable ways and you tried to hold on as long as possible, but in a frenzy of desperation and agonizing pain, you ended up revealing the secret before you could be rescued.
You ended up in the hospital with bandages all over your body, broken bones, and permanent losses. You had been through intensive care, but when you regained your memory you were in a common room, with a tense silence while the machines showed the readings of your signs. Yagi would enter the room after a few seconds, staring at you behind his dark eyes, feeling his stomach drop at the sight of his student so hurt and battered. He closed the door behind him and carefully approached the stretcher, carrying a small white box with a tender pink ribbon on top, holding it gently in his hands.