I understand your position, but I think it's highly idealistic: MOST people feel miserable when they're alone for a long time - men and women alike.

IN THEORY we should be as strong as you say; IN REALITY, very few people are like this (and maybe you're one, but in this case you're the exception and not the rule).

Humans are a social species: without thriving and fulfilling relationships, we wither and die. Even science acknowledge this (e.g. married people live longer).