Regret

In the book Amir continued to sin after the first major sin he committed, which was watching Hassan get raped by Assef. On top of that he disowned Hassan when he needed him the most, he stopped playing with him and completely tried to avoid him. Also he made Ali and Hassan move out causing Baba great grief because Baba's childhood friend was moving out. Ali was the only person that Baba could trust in Kabul. Amir can not make up for his sins