The simplest definition of emotionally abusive behavior is anything that intentionally hurts the feelings of another person. Since almost everyone in intimate relationships does that at some time or other in the heat of an argument, emotionally abusive behavior must be distinguished from an emotionally abusive relationship, which is more than the sum of emotionally abusive behaviors.
In an emotionally abusive relationship, one party systematically controls the other by: •Undermining his or her confidence, worthiness, growth, or trust •Manipulating him/her with shame or fear.
In many ways, emotional abuse is more psychologically harmful than physical abuse. There are a couple of reasons for this. Even in the most violent families, the incidents tend to be cyclical. Early in the abuse cycle, a violent outburst is followed by a honeymoon period of remorse, attention, affection, and generosity, but not genuine compassion. (The honeymoon stage eventually ends, as the victim begins to say, "Never mind the damn flowers, just stop hitting me!") Emotional abuse, on the other hand, tends to happen every day. The effects are more harmful because they're so frequent.
The other factor that makes emotional abuse so devastating is the greater likelihood that victims will blame themselves. If someone hits you, it's easier to see that he or she is the problem, but if the abuse is subtle - saying or implying that you're ugly, a bad parent, stupid, incompetent, not worth attention, or that no one could love you - you are more likely to think it's your problem. Emotional abuse seems more personal than physical abuse, more about you as a person, more about your spirit. It makes love hurt.
The book that was suggested to you will help. The body of knowledge from which the book was composed will help.
"Always go straight forward, and if you meet the devil, cut him in two and go between the pieces." - William Sturgis, clipper ship captain, 1830's.