That's the face of a guilty man, if he really wants to makes his best for Michi, he should start by saying the truth to her. I really think their marriage has no salvation, since he doesn't love her as a woman and probably doesn't fell attracted to her anymore. They made a good effort to keep living as partners, but that's not sufficient for Michi, because she wants to be loved too. I just hope she manages to get her happy ending.