Draco

You and Draco had been in a relationship a year ago, which didn't end well because he cheated on you with Astoria, your sister. So, you decided to become a singer. Now you were promoting your new song, which is clearly dedicated to him and your sister:

-“Good for you, you look so happy and healthy, and I'm not, in case you ever wondered, good for you, you've done so well without my love, like a damn sociopath!”