I guess what I've been wondering is who believes in soulmates?

It's an overrated concept. The truth is that a healthy, loving person can form a deeply satisfying, gratifying relationship with any one of millions of people. When you get a man and woman who are both mature, intelligent, attractive, and willing to invest in the relationship---and there is chemistry, of course--they can form the deepest bond possible every time. This idea that for each person there is just one special individual somewhere on the planet that is his or her soulmate is what leads to the "grass is greener" syndrome. In other words, instead of continuing to cherish and appreciate the partner one already has, one starts to look for some ideal person he or she is missing out on.

The ideal soulmate doesn't exist. It's an unrealistic fantasy. The most beautiful, long-term relationships people enjoy continue to flourish because both partners continue to work hard at those relationships, and they continue to appreciate each other despite the inevitable shortcomings and challenges.