I don’t believe in soulmates per se, but I do believe in perfect compatibility between two or even more people, in some one-in-a-million cases. I don’t like how the term is perceived, though; when you hear of someone’s soulmate, you assume there’s a romantic relationship between the two. I believe having a soulmate can have nothing to do with romance.
Is your love interest the only person without whom you can’t imagine living your life with and also wouldn’t want to? I should think not.