According To Greek Mythology…. 
The first humans were created with four arms, four legs and four eyes… They had two noses and two mouths and they terrified Zeus… He believed they had eminent powers and feared there would come a day when one would take his place as Ruler. To prevent such an incident from ever occurring, Zeus split each human in half and left them to wander aimlessly around the mortal world searching for their other half….. Their one true soul mate.