When you enter into a new relationship, it can feel as though you're walking on air. As you get to know each other, however, you may realize that you and your partner don't have as much in common as you originally thought. For example, in the beginning, your girlfriend may have tagged along for baseball games given your avid following of the hometown team. But a few months into the relationship, it becomes apparent that she can't be bothered to go to a game, let alone watch one at home with you. When you ask what brought on the change, she admits she was never crazy about baseball to begin with. She just wanted to make a good impression on and spend time with you. Now that she's comfy in the relationship, she doesn't have qualms about declining your invitations outright. Similarly, your partner may have led you to believe that they share other interests you may have -- whether reading, exercising, dancing, science, history, or cooking -- only to later ...