When Zeus created the humans he created them with four arms, four legs and two faces. It did not take long before the human started to act superior, questioning the gods powers. To punish them, Zeus split them into two halves, each one with two arms, two legs and one face. They were forever condemned to roam the world searching for their other half, never feeling complete until they do.
And that my friends is how Plato describes a soulmate in The Symposium. Beautiful I think.. Especially since some of the originally humans had the same sex resulting in that a man search for another man or a woman search for another woman, hence homosexuality. Have you found your soulmate yet?