Love. Partnership. "Soul Mate" – So many of us spend a good chunk of our lives looking for "The One." But what happens when we actually find someone? How do we know if they’re the person who is right to spend the rest of our lives with? Or even if starting a relationship with them is the right choice? While compatibility is no guarantee of longevity, studies show that it is directly related to the quality and satisfaction of our relationships. Simply put, the more compatible you and your partner are; the happier you're likely to be with them.