Beginning of the end
What hurts the most is that Jack didn’t even have the decency to talk to her about it in person. In addition, he addressed her as his wife at the start of the letter and then told her he no longer loved her at the end.
The end of a marriage
Laura was completely unaware of Jack’s feelings. The announcement seemed to appear out of nowhere to her. She began to blame herself for their poor communication because she was oblivious to the fact that things were already falling apart.