Super tough to review this book. Yes, it includes elements of BPD, some of which I relate to heavily, but it fails to deliver any insight into the workings of Brody's mind. More specifically, I felt irritated by the way in which Brody describes the way he sees things (he does not see anything as black and white, just grey); this is honestly a complete opposite of how people with BPD tend to view the world.
The author has a superb way with words, and is able to conjure up strong emotions in the reader, but overall I felt that the novel had no real story; no beginning, middle and end - instead, just a sequence of rather repetitive situations, all spiralling more and more out of control. Brody is obviously a 'loud' borderline, which accounts for his temper, rage and frequent outbursts of anger. This is, of course, fine, but I would like to see a 'quiet' borderline sometime in a novel; perhaps though, the quieter ones are harder to write.
Overall, I give the book a 3.5 because I felt that Brody had a strong voice, and a lot of potential, pacing was also extremely good, especially towards the end where we watch Brody lose control. That said, the lack of plot really got to me, and I was particularly disappointed that he never found the help he deserved - though I also feel that this is reflective of true life in the case of many people whom are silently suffering from BPD.