Bai Tianheng knew that he couldn't completely fault her after knowing the truth.
As for where he was during that period, he knew very well.
It was during the conflict with the Li Clan, who had challenged them and wanted to assert their dominance over the Desolate Heaven Empire.
He had been preoccupied with dealing with them when the news of Mu Yuelan taking the Dao Bone from Bai Xinyue reached his ears, and he acted immediately to deal with it.
By then, Dao Bone has already been taken away from Bai Xinyue and he didn't need any other evidence to know that what he heard was true.
His wife has taken Dao Bone from Bai Xinyue to increase the Cultivation talent of Bai Zihan.
Thinking that Bai Xinyue's life would be in danger—and not knowing what his wife might do—he had Bai Xinyue exiled from the clan.
Of course, he had sent many protectors and continued to help her in secret.
