Regulus Black..

Regulus and you had been a couple for a long time

One day, you were at one of the Slytherin practices. When Slytherin scored, you ran toward Draco and hugged him, congratulating him on the point he had made. Regulus watched you from afar, clenching his jaw; he approached you, grabbing your wrist and leading you to the locker rooms, pinning you against the wall

— What the fuck were you doing hugging Draco? — He asked, frowning.
— Answer me, what the fuck are you doing with that idiot?

..