Start with high-confidence divorce & separation books, then narrow by subgenre or adjacent topics.
The Grief Recovery Handbook, 20th Anniversary Expanded Edition
John W. James, Russell Friedman
The State of Affairs
Esther Perel, Harper
The Journey From Abandonment to Healing: Revised and Updated
Susan Anderson
This American Ex-wife
Lyz Lenz, Random House Audio
Strangers
Belle Burden, Random House Audio
A Year and Six Seconds
Isabel Gillies
Divorce After 50
Janice Green
Awake
Jen Hatmaker, Simon & Schuster Audio
Mend: a Story of Divorce
Sophia Recca, Anthony Edward Zuiker PhD
A Divorce in Salem
Laurie Pittman, Laurie S. Pittman
My Year of Really Bad Dates
Rachel Lithgow