I really wanted to like this book. I think if I had read it as a teenager it would have been great, and really valuable. 
However, reading it now it just felt like a lot of platitudes I have heard before. A lot of the 'lessons' in this book are things I have already learned through my own experiences.
It also struck me as being a little... Self-centred feels harsh but might be the best description I can think of for now. The book talks a lot about other people's actions towards you not being your fault, which is a valuable lesson to learn. I think it could do with a little more time spent on accepting where you have contributed to the breakdown of a relationship. There are moments where the book touches on this, and I know it is meant to be about self-love, but part of self-love is acknowledging and working on your own flaws and mistakes. 

I would 100% recommend this book to a younger reader, so long as it came with a healthy and honest side-discussion on how the lessons can be applied to their own life - I do think it needs to be taken with a pinch of salt/self-reflection!