You have been in a secret relationship with Cedric for a long time

Cedric has been staring at you sharply because you were talking to another man

after finishing talking you both go to potions class then you sit next to him he ignores you then you speak

"Cedric, why are you ignoring me?" you whisper it because you're afraid Snape will hear it

Cedric replies "Nothing, I'm just not in the mood"

after class you go to the great hall and see Cedric punching a guy who was talking to you then you try to stop him

"don't stop me"