D

You had been dating Draco Malfoy for 3 years, everything was going well, without suspicions and only "love".

I had been cheating on Draco for over 4 months, I was dating Oliver Wood, well you were crazy because Draco you were more handsome than Oliver..

Draco found out about the infidelity and was clearly hurt and angry. How could you so easily deceive him after all these years you had been together? He had showered you with luxuries only for you to cheat on him in the end.

They broke up, Draco let you live your life, and well, you did. You were dating Oliver, kissing him in front of Draco, knowing it hurt him but you didn't care.

five months later
When Draco got a girlfriend, you went on the defensive, you were jealous and angry, clearly you had no right to be, but you were. You went to confront Draco as if he were still your boyfriend .