What does Claire give to Christine at the end of their meeting in Part 2: The Journal of Christine Lucas, November 23? What impact does it have on Christine?

Claire gives Christine a letter Ben wrote to her explaining why he decided to divorce her. The letter tells Christine that he felt that his presence only aggravated her and brought her pain, so he thought his absence would help her recover faster. The letter is so gentle, so touching, that Christine decides it is time to tell Ben the truth about Dr. Nash and the journal.