Harry gets a new life

Set at the end of 5th year. Harry learns he's a Horcrux after Sirius is killed and it changes him drastically. He can't take it anymore. The light only wants him to die for them and he has no interest in dying for anyone. He writes a letter and hands it to Draco on the train to give to his father. He's done begging the light to help him Harry/Draco pairing.