Michael felt remorseful.
Michael regretted that he didn't find an opportunity to spend time with Leah alone earlier.
If he were to find an opportunity to spend time with Leah alone earlier, he would have found out that Leah was his daughter long ago.
The earlier conversation that Michael had with Leah foreshadowed the later probing questions.
However, Leah exposed the truth herself before Michael even started probing into the situation.
"Uncle Michael, you didn't know about it?" Leah asked Michael, blinking her big innocent eyes.
Michael initially thought of Leah as Todd's daughter. He even treated Leah differently because of their relationship.
Then, Michael frowned at Leah's question.
It was obviously Wendy's decision to have Todd bring Leah to Lake City as Leah's father.
The purpose why Wendy did so was obvious too. She didn't want him to know of Leah's existence. She didn't want him to know that he had another daughter.
