Living and Loving after Betrayal: How to Heal from Emotional Abuse, Deceit, Infidelity, and Chronic Resentment by Steven Stosny PhD http://www.amazon.com/dp/1608827526/ref=cm_sw_r_pi_dp_.ZO2tb0KFBK5JJ36
This book is a must-read for anyone in a relationship with someone who is showing signs of psychological and/or physical abuse. I highly recommend it. It is so helpful in making it possible to recognize and analyze destructive patterns in a relationship, leave an unhealthy relationship, and avoid getting involved in a new unhealthy relationship. It is available on Amazon.