John felt lonely
In the moment of Donna’s departure from the room, John pondered the possibilities of restoring his peace. However, things turned out quite differently. After Donna departed, he was all alone and unhappy.
I can see why he was upset and reluctant to forgive her for what she had done; he was still missing her. She was his wife for 18 years, and they had a lovely time together. Her absence left him feeling devastated since Donna played such an important role in his life and household. Without Donna, it was impossible to imagine what life would be like.