what story did rahim kahn tell amir on his birthday

Rahim Khan confesses to Amir that he was almost married to a Hazara when he was eighteen. Her name was Homaira and she was the daughter of his neighbor's servant. They had plans to marry each other but, Rahim Khan's father put Homaira and her family on a lorry and sent them off to Hazarajat and they never saw each other again.