When you think of your life long partner, do you think of the word love? Most people do. Of course, some of those relationships started out with lust, or even with an infatuation. So when you meet someone that catches your eye, how do you know if it’s love, or if it’s lust, or if it’s infatuation? Another way of looking at this is questioning whether how to build a solid relationship can be built on lust or an infatuation. Love is generally understood as being unconditional in nature.