Whether you’ve been in a relationship for ten years or ten weeks, you know how crazy love can make you. On any given day you’re insanely happy, maniacally miserable, kooky with contentment, or bonkers with boredom—and that’s in a good relationship. Why do you think we call it being “madly” in love? You have to be a little nuts to commit yourself, body and soul, to one other person—one wonderful, goofy, fallible person—in the hope that happily-ever-after really does exist. And yet we can’t help ourselves. We throw ourselves into love time and again, even though we know real-life love is no fairy tale. We stress out and make up and do it all over again—and why? Because nothing makes us feel more alive than the exhilaration and exasperation of everyday love.