I think they exist.
Just not always romantically.
I think there are certain people you will meet in your life who you just connect with more than anyone else and you just know it isn't a typical thing and you understand each other perfectly.
And this person won't always be your "significant other".
I mean it could be your friend or sibling or parent or teacher or the person you're dating or whoever.
it could be just about anyone you've ever interacted with.