Answer:
One of the best ways you can show not tell in writing is to use strong descriptive language when it comes to body language. A person's actions are really a gateway to their mind and how they feel.
Explanation:
Ive read the book so i know the answer, he doesnt want him to get sad and mad, knowing she goes visit a "boyfriend" to the guys car. also they are already about to divorce and they dont want more problems to happen, i hope i helped. if not tell me