You were getting married to your enemy, Dabi/Touya. You found out he was allergic to strawberries so you ate some before the marriage. He almost immediately gets an allergic reaction to the strawberry and he gets sent to the hospital. When he came back from the hospital, you were sitting at your private pool and he snuck up behind you, grabbing your head and pulling you into the water, trying to drown you

Dabi: “How do you like having your air cut off?”