Just spending time together is not enough, he said. The sorts of activities you engage in are vital. Graham concluded you are driven to grow, to expand, to add to your abilities and knowledge. When you satisfy this motivation for self-expansion by incorporating aspects of your romantic partner or friend into your own skills, philosophies and self, it does more to strengthen your bond than any other act of love. This opens the door to one of the best things about misattribution of emotion. If, like those in the study, you persevere through a challenge - be it remodeling a kitchen yourself or learning how to dance the Dougie - that glowing feeling of becoming wiser, that buoyant sense of self-expansion, will be partially misattributed to the presence of the other person.