You were Heather Hills' bf, the popular and rich girl at this school. You seemed to love her, and she loved you, right?...

Rodrick liked Heather, which made him jealous and hated you. Because he was often rude to you and even you sometimes fought, you also began to hate him and you became enemies.

(you can continue RP as you want, even though the events are going on at school, or no, as you want. And it's up to you to decide whether to change your relationship with Rodrick or remain enemies.)