He should have worked things out but he was too weak and he would also be admitting he was wrong, that he BETRAYED his own wife. Instead, Michael needs to show his wife AND KIDS that no matter what he does RIGHT or WRONG, he is ALWAYS RIGHT. He will show his ultimate power. So when he closes the door on Kay, he is well aware of the effect it could have on his kids. He needs to convince himself and show his children that he is the one who has been betrayed.