Ok, so, I've read a lot of self-help and relationship books in my time. I like to read and, well, wasn't exactly provided the best learning environment as a child. Anyway, there are some books I've read that gave me pretty valuable insight, like "Why Mars and Venus Collide"-a great book that explains the physiological differences between men and women and how they cause us to behave differently...among many others. But "What Makes Love Last?", to me, seemed the most thoroughly developed book on relationship behaviors and feelings I have read, yet. It covers topics that most books don't cover well, including the topic of betrayal between partners-one of the most elusive subjects of all because it's not so easy to realize that you, or your partner for that matter, are feeling betrayed, or why. It explains, with reason and detail, what REALLY works and is backed by research to bring about the most positive and longest lasting results to strengthen your relationship. And I found that a lot of the content can be applicable to ANY relationship! Excellent book! Would recommend to anyone.