Suggest me a book to better understand relationship abuse

I’m asking this because my girlfriend has detailed to me what has happened to her in a past relationship where there was emotional abuse, sexual abuse, and some physical abuse. While she worked on this in therapy extensively, I still want to better understand relationship abuse, mindset of victims, and what recovery looks like. Basically I’m hoping that a book out there can make me a better advocate or show me if there are ways to improve