There are 2 titles in this book, which are about the following topics:
Topic 1: Getting back together can be tricky. Hurt feelings have to be put aside or discussed. Closure has to come, and communication has to be at a higher level. At a vulnerable stage when your ex is still indecisive (whether he/she admits it or not), there is a window of opportunity of getting back together. If you use it well, chances are that it can work out again. But I think it's safe to safe that during this crucial time period, it matters what you say and do to gain his/her trust back.
Topic 2: Most people have experienced simple manifestations of jealousy, but there are exceptional cases and disorders that must be mentioned. In this book, some of those brain functions that border on insanity will be discussed and explained.
Aside from that, several chapters of the book refer to jealousy problems in marriage and other relationships. Apparently, this problem is more common than many presume it to be, so it is worth mentioning.