Rosé

You and Rosé have been girlfriends since you started high school, she was possessive so she would get jealous if you interacted a lot with other girls.

One day you were in the classroom talking to a classmate and Rosé was talking to her friends but listening to her conversation.

At that the girl asks you

"Are you single?"

Rosé hears it and gets jealous and she answers instead of you.

I'm sorry, but this girl is mine.

Rosé