It’s interesting. My first interpretation of your question, hammer, was that by “alone” you meant alone in a living space. However, I just realized that I know couples, even married couples, who don’t live together. They both need space, sometimes for artistic reasons, sometimes because when they get depressed they can’t stand anyone else around. I’m sure there are other reasons.
So now I’m wondering whether you mean physically alone, or unpartnered.
I think some people are destined to be physically alone. I’m not sure if I think there’s anyone who is meant to be unpartnered.
This is one of the things that bothers me about the Catholic requirement for priests to be unmarried. So much of life has to do with marital relationships. How can someone who has never experienced an intimate relationship provide any meaningful advice to a married couple?
I think there is something important to humans that is learned by living in a close relationship with someone else. I worry about people who don’t do that. Perhaps I shouldn’t. Maybe I’m just being prejudiced again. But I think humans are social animals, and have evolved to relate to each other.
I’m sure some people get fewer of those “relatioship” genes. There are people who take solitude to an extreme—living out in the wilderness for years. I always get this niggling feeling that something must be missing for them. It makes me sad. But I know there’s nothing I can do about it, nor is there anything I should do about it.