Gimme back my book

I (17f) am so enraged at my ex (17m) right now. So for a little background we started dating December 2024 and then dated a whole year and then February (right before Valentine’s Day) he dumps me and says i was too high maintenance. It hurt me to hear, but it’s not uncommon that guys say stuff like that to me. The relationship was perfect, and the breakup was kinda out of nowhere. Anyways, for our first year anniversary I made him a scrapbook by hand. it took me a month to make, and he absolutely loved it. Well, for the magnet part to keep the book together when closed, I had to create a makeshift magnet. I used my late grandmother’s brooch for the magnet, because it was metal. I was hesitant to give it to him, but I was so sure we were meant for each other so I gave it to him in December 2025. Then, when we broke up, I asked for it back, since it was my late grandmother’s. I waited for like 5 months until my mom went to go get it for me. I guess I should’ve freaking clarified I wanted the whole book back. This boy has the audacity to ask my mom if he could KEEP THE BOOK. My mom said yes, and apparently he put it back on his desk. I’m just so mad because I thought I was being clear that when I asked for the brooch back, I wanted the whole book back. I thought it was common sense. And what reason would my ex have to keep the book, anyways?! HE dumped ME not the other way around so how dare he have the audacity to keep the book after I wanted it back. I guess it technically is his since I gifted it to him, but the whole situation doesn’t make sense to me. Why would he still want something like that from me, and why does he have it on his desk??? Everyone says it’s bc the book is sentimental to him, but I lowkey think he kept it just to make me mad. He abandoned me like I was no more than dirt, and even made a joke and laughed when dumping me.
I lowkey do wish he’d see this though and give me back my book but I don’t think he has reddit.