Books on Fearful Avoidants?

Just wondering if anyone knows of any good books on Fearful Avoidants specifically or just attachment theory in general (already read Attached). I feel really traumatized by being blindsided & discarded by my FA ex two months ago, and it feels difficult because he really rarely gave off classic avoidant signs that the literature usually describes for DAs. He was very emotionally unstable and fluctuated between manic and depressed states and I have no idea if that was related to the FA thing or if he had BPD like things going on or not, but all the hot and cold signs felt more related to those mood swings than how he felt about me, so I completely overlooked all the signs.

From looking through this sub I can see how he had a lot of the classic FA signs people seem to repeat (chaotic upbringing, super emotionally turbulent, chases the dopamine of toxic/unhealthy relationships, basically broke up with me because we were too stable/healthy past the honeymoon stage) but I'd like to learn more/not sure where this information is sourced from.