What he let happen between himself and Mavis earlier was a test he set for himself.

He wanted to see how much he cared about Rena.

When Mavis leaned toward him earlier, he instantly thought of Rena. With his mind's eye, he saw her playing the piano with such vigor and passion. Then, his heart started racing. The ‘only woman who could make him feel that way was his wife.

Men always weighed the pros and cons of everything.

This time, Waylen chose Rena and his children.