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If you are wondering about how you are being treated, or how a friend or family member is - and wonder "is this okay? is this good? is this fixable?" -- read this book. It's very good on both outlining what might be causing certain "jerk" behaviors - how bad they are from an uninvolved viewpoint - what you can & can't do - if you should consider leaving, or if you need help. I really found this to be a valuable book.