Based on the number of people who believe they have found their "soul mate", I don't believe that there is any one person meant for us all - the statistical likelihood of finding such a person is close to zero. The way I see it is everyone is compatible with everyone else to a certain degree, or "goodness of fit" if you will. Someone who you do not get along with at all might not "fit your curve" at all, whereas your "soul mate" would be a near perfect match, but there are probably many people that fit this criteria.

Now, if only there were an accurate chi-squared test for relationships...