If the emperor really loved Yi Tong, she couldn't have lived outside the palace for six years without knowing that she was pregnant with his children and gave birth to them, and she didn't visit them for six years.
Later, when his son grew up, he went to the palace to find his father, and the emperor let them live in the palace. When the position of Zhang Yuzhen's son (Prince) was threatened, the emperor took a clear-cut stand to defend the dignity of the prince, took him to court, and declared the prince as his heir to the throne in front of all ministers. Since then, he has let the prince listen to politics every day.
Detailed introduction:
Zhang Yuzhen was at odds with the original Minhou, and Yi Tong became a pawn of the Minhou Party. On the issue of bringing down Zheng Yuzhen, Yi Tong became a witness, which forced the emperor to grant Zhang Yuzhen the death penalty. Later, because Yi Tong's son was smarter than Zhang Yuzhen's son, courtiers and court officials thought that Yi Tong's son would replace Zhang Yuzhen's son, the prince, to the throne. The emperor decided to abdicate and let Zhang Yuzhen's son (prince) ascend the throne in his lifetime.
After Zhang Yuzhen's death, the emperor did not make Yi Tong the queen's throne, but remarried with the queen. In addition, in order to prevent Yi Tong from threatening the prince, Yi Tong was expelled from the palace. There are indications that Yi Tong is just a tool used by the emperor to give birth, and there is no love at all, but Zhang Yuzhen is different. The emperor loved her very much, and out of political pressure, he gave Zhang Yuzhen the death penalty, just as Li Longji, Emperor Xuanzong of China, gave Yang Yuhuan the death penalty.