My first exposure to this phenomenon happened when my parents were in a nursing home. I visited daily and knew the staff and many of the residents. One elderly man on their floor had later stage Alzheimer's disease. His wife of many decades visited him at least once a day until she was diagnosed and treated for breast cancer. Even during the worst of her treatment, she visited as often as she could. Then, she died.
“I hold onto your book as a life preserver and am reading it slowly on purpose...I don't want it to end.” Craig William Dayton, Film Composer