"The One"

When it comes to relationships, people often spend years or sometimes even a lifetime searching for "the one". I question whether there is such a thing as "the one". There are over 6 billion people on Earth and we are expected to believe that there is only one other person out of all those people that you were meant to be with? If that's true, what if your true soul mate is someone who lives in Thailand or Uganda or Iceland and you never meet that person. I can't believe that there is only one person out there for me. I do believe my boyfriend is the person that I want to spend my life with but that doesn't mean there isn't someone 100 miles away or even 100,000 miles away that is perfect for me and that I would love just as much. So may people are disappointed when "the one" ends up being "the wrong one". How would you even know if the person you are with is "the one"? Matters of the heart are trick things and the heart can play tricks on us, so how can one really ever know if the person you love is your soul mate, if there is such a thing?