What are some good books that deal with the subjects of infidelity, jealousy, and insecurity in relationships?

My significant other and I are both dealing with feelings of insecurity and jealousy over one another, which automatically leads us to the subject of infidelity. Are there any spiritual or new age books that help with this subject? I’m not exactly interested in a religious point-of-view, but more of a self-help or psychological book that unravels the egotism behind these topics.