The author puts their characters though so much trauma in this book. Just an FYI. 
I enjoyed the premise of watching this friendship span 30 years and at each point in their lives break apart and put themselves back together in their own flawed way. The main characters were extremely flawed and almost to the point of being unlikeable in their stubbornness. The trama themes were a bit too much for me but well written and excellent story building. 
The audiobook narrator did an extremely fantastic job.