Wow, did you try actually reading the book? It’s been revised and updated, and the author Dr. Stanton Peele has another half dozen books addressing addiction.

Here’s an interview with him from 2015: http://www.williamwhitepapers.com/pr/2015%2520Dr.%2520Stanton%2520Peele%2520Interview.pdf

Love addiction is an old problem that was explored in fiction by DH Lawrence in “Women in Love" (1920).