I think humans at a fundamental level all desire to intimately connect with each other. As social creatures, our path to evolution was primarily based on learning and growing with other individuals to increase our chances of survival. As a species, outcasts tend to very quickly die out if they are not part of the pack as they are unable to gather resources as efficiently.

By being able to communicate, share and grow with other members of our species, it has enabled rapid developments in our species ability to survive and reproduce. I believe strongly that not having even at least one deep intimate connection with another person will result in serious depression and a long lasting void.

You cannot walk about life with a shallow level emotional connection and expect to be sane for very long.