Why did General Li Yin divorce yang hu?

During the war, his first wife, Nan Zhou, was injured to protect General Yin. The general thinks she's dead. Yang hu, whom I met in Shanghai when I was injured, got married. The general went to the front to fight and met Nan Zhou. The general can only stay with him and stay away from yang hu. General Yin did not divorce yang hu, but never went back to find him, so yang hu went to General Yin's hometown to wait for him.