This is the chapter right after the rape of Hassan. In chapter seven, Amir sees the atrocity that is committed against Hassan and he does nothing about it. For this reason, he is filled with shame, guilt and anger with himself. What compounds this is that Hassan is still a loyal friend. He does not hold anything against him. Amir cannot live with this. So, he begins to spend less time with Hassan.
In this chapter, he spends a lot of time alone in his room. He avoids people and even when Hassan wants to take a walk or when Hassan wants Amir to read to thim, Amir feels a great sense of guilt. At one point, Amir ask Hassan what he would do if he threw a pomegranate at him. Hassan does nothing. Amir then begins to hit him with pomegranates and Hassan does nothing. He will not retaliate. Hassan then takes a pomegranate and smashes it on his own head and then leaves.
Amir now has alienated Hassan.