Book excerpt: There are many books that promise to help you fix a bad relationship. This groundbreaking bestseller is the first one to help you choose whether you should even try—or if you need to go. Psychotherapist Mira Kirshenbaum draws on years of research and her work with real-life couples to help you make the right decision. She shows you how to diagnose your unique situation with self-analysis and questions like these, which get to the very heart of your problems: • What sins are forgivable and which ones are unpardonable? • Is your partner questioning your opinions to the point where you doubt yourself? • What is your sex life really like, and how important is it? • Is there real love left between you, and how does it stack up against all that you find unlovable? Mira Kirshenbaum provides expert guidelines that are the key to making all your choices, concrete steps that you can implement right now, and the ultimate way to determine your personal bottom line—what you need to be happy. This remarkably insightful and probing guide offers advice that lets you see the truth about your relationship—and with wisdom and compassion, it helps you act with the confidence of knowing that whether you decide to go or stay, you are doing the very best thing.