Yes, in the last pages of the book when Kay ran off to New Hampshire and Tom gives her the "straight talk" speech about the family. Then tells her "If you told Michael what I've told you today. I'm a dead man".
Another GREAT part of the novel, which may have done much to explain Tom's growing "resentment" with Michael in Part 2.
Think about it. It was Tom, who Michael trusted to go up to New Hampshire to talk to Kay. Yet, he confides to Kay that his very words that would be succesful in changing her mind, could go on to get HIM killed. Hardly fair, am I right ?