You said you contacted him about the book but you mentioned said book in one sentence, then you wrote many paragraphs how sad you are without him. If it was about the book, you’d only talk about the book. He already knows you are sad. He obviously doesn’t care. At this point I think you need to work on self respect. You continue looking for ways to keep contacting him.

Just because he did all these nasty things before it doesn’t mean it’s ok or that you need to pursue him. The fact that he keeps doing it tells you all you need to know about him and this relationship. He doesn’t respect you. If he did, he’d not block you. Why are you pursuing someone who is so blatantly disrespectful? So what he already said all those things before? It doesn’t make it ok.

And I think situation with the book is a symptom in your relationship. This book means a lot to you but he doesn’t even remember he has it. Same with your relationship. You spend days miserable figuring out how to contact him but he doesn’t give it a thought and is living his life

Have you considered therapy for yourself