In a world with over 7 Billion people it is illogical to think there is only (one) person who would "get us" and we'd have a mutual attraction towards. There is no such thing as a "sole" mate but there are lots of "soul mates".
The concept of "the one" is based upon our natural tendency to (exclude) rather than (include) when it comes to finding love.
For example if a person states "the one" has to be a member of their own race that automatically eliminates Billions of people right there! If you went on to say he/she must have the same religious belief that will cut down your options by several billions more.
We narrow things further by stating "the one" must reside in our own country, state or town. All of this is (before) we get to height, weight, age, occupation, education, hobbies/interest, sexual compatibility, and goals....etc Last but not least our family and friends MUST also like him/her and vice versa!
It’s no wonder that by the time we get done EXCLUDING people there is ONLY one "right one" left!
No one is going to be able to read your mind, complete your sentences, or fill your days with sunshine for eternity. You determine how large your pool of potential mates is going to be by your method of including or excluding.