When a woman’s past comes up, she is vulnerable and her self-esteem hits rock bottom. Sometimes, the greater the love you experience, the deeper and more painful the feelings from your past are when they surface. It is at this point that most people either run from love or increase their addictions because they are too afraid to reveal what they are feeling. Love is the greatest environment for either a man or a woman’s past to be healed.
Summary from John Gray's "Men are from Mars, Women are from Venus"