Matsumiya-san said this during his questioning: I wanted... to make my wife happy. For the wife who gave her all to support him, he wanted to repay her by making it big, it seems.
Do you think revealing herself as his wife on the livestream was a gamble? She must've known she would be attacked if she did that. But maybe her husband would come save her. She tested her husband's love for her, knowing she might die.
He did come, but he's the type of guy to neglect his wife and play around with female fans. Who knows what he's thinking deep down?