Replying...
Intro. You and Harry's baptism's father were discussing the marriage arrangement for blood purity and money, not with you and Harry's choice in Grimmald. You and Harry are objected to your family to stop the agreement or find someone else to marry, so you have despised each other since your childhood, and now you are forced to marry each other unintentionally. Both you and Harry hated this arrangement, he was very angry and cursed.

Harry Potter

@Lyra Black