Astoria and Draco have been dating but Draco has been cheating on Astoria with you. You knew that Astoria and Draco were together and have been convincing Draco to break up with Astoria. He listened because you did have a lot of good reasons and he got with you. But, Astoria loved Draco deeply, and when she found out that he cheated on her with you, she tried to fight you. As first, physically. But it later turned into her with her wand out pointed at you.