context: According to the Secret History, Temüjin again offered his friendship to Jamukha, asking him to return to his side. Temüjin had killed the men who betrayed Jamukha, stating that he did not want disloyal men in his army. Jamukha refused the offer of friendship and reunion, saying that there can only be one sun in the sky, and he asked for a noble death. The custom is to die without spilling blood, which is granted by breaking the back. Jamukha requested this form of death, despite the fact that in the past Jamukha had been known to have boiled his opponents' generals alive.
question: Who did Jamukha refuse to be friends with again?
answers.text: Temüjin