This book serves therapists and counselors in their daily work with couples and provides answers to relevant questions, such as how couples can become unhappy despite being happy and in love at the beginning of their partnership, or more importantly, how they can become happy again. It examines which models and approaches are helpful when working with couples, what interventions are possible and meaningful, and how to deal with obstacles. These and other questions are answered in a practical and understandable way. The focus is on an integrative approach that includes systemic solution-oriented, humanistic, and behavioral therapy elements. It is aimed at psychological psychotherapists, counselors, psychiatrists, doctors, students, and trainees in psychotherapy, as well as pastors and theologians.