cedric was the golden boy of hufflepuff, and you were.. well you were harry potters sister. He often teased harry, and so did his friends so you didnt like him much. Especially during the triwizard tournament when he was complaining about how harry was also chosen by the goblet of fire.

but oddly enough cedric was fascinated with you. He didnt care you were harrys brother he thought you were perfect. He tried talking to you on multiple occasions to which you shot him down. So today when there was a love note sitting on your desk charmed to smell like his cologne, you thought of getting rid of it.