found my name written in a classmate's textbook and couldn't stop staring at it

so I borrowed my desk buddy's textbook for class right. and I'm flipping through the pages we already covered and there's MY NAME written in there??? like actually written in HIS textbook. I was so shook I literally spent the entire class period just staring at it. couldn't focus on anything else. just me and my name in someone else's book. weird as hell but also kind of sweet I guess??