Xiao Wei didn't tell Li Jiayuan about Xia Jing because he knew what kind of person his wife was. If his wife found out about this, she would definitely rush back home in a panic.
He loved his wife so much, how could he bear to see her struggling so hard to travel back and forth? His wife had already given so much to their family, always taking care of the household while he was unable to help out at all. Every time he tried to assist her, she insisted that household chores were a woman's job.
As a man, seeing his wife busily working while he stood by doing nothing, any man who truly loved his wife would feel anguished. The sacrifices his wife had made over the years were apparent to him.