This is the type of loneliness I’ve so often, too often, been feeling for decades, beautifully put into words by Fredrik Backman in his book “Anxious People”:
“
The […] was sitting alone in the hall. She could hear the voices of the people […], but they might as well have been in a different time zone. There were eternities between her and everyone else now, between her and the person she had been that morning. She wasn’t alone in the apartment, but no one in the world shared her prospects, and that’s the greatest loneliness in the world: when no one is walking beside you toward your destination.
“
The Little Prince and the Fox 