What does Ben tell Christine about her son in Part 2: The Journal of Christine Lucas, November 14? What is Christine's reaction?

Ben tells Christine that their son, Adam, had been killed after joining the Army and going to Afghanistan. Christine is overcome with grief for her dead child. This grief causes her to have a memory, to remember the name of her dear friend. Claire. Christine asks Ben about Claire and he tells her that Claire had given up on her years ago and moved to New Zealand after marrying.