What does Claire inform Christine about Christine's affair in Part 2: The Journal of Christine Lucas, November 23?

Christine has already guessed she was having an affair and Claire confirms it. Claire tells Christine that she had had trouble adjusting to motherhood, so Claire had suggested she take an afternoon a few times a week to write in a café. In time, Christine had apparently met someone there. Claire had confronted her on it and Christine told her that she had ended it.