Why did Zhang Yi plan to escape from Qin?

After the death of King Huiwen, Prince Yingdang ascended the throne and became King Wu. King Wu was a man of brute strength, able to carry a cauldron, and was very brave. When he was the prince, he looked down upon Zhang Yi, who made his job as a lobbyist. After he ascended the throne, some ministers who were jealous of Zhang Yi took the opportunity to slander Zhang Yi, saying that Zhang Yi was dishonest, capricious, and betrayed the country for personal gain. If the Qin State continued to use him, he would be laughed at by everyone in the world. Those princes who had listened to Zhang Yi's lobbying and made good friends with Qin, when they heard that King Wu did not like Zhang Yi, broke their alliance one after another. King Qi Xuan felt that he had been fooled by Zhang Yi and vowed to kill him. Zhang Yi's alliance failed, which made King Wu look down on Zhang Yi even more. Zhang Yi knew that he was in danger and might be killed, so he planned to escape from Qin.