What does my classmate mean? What's he trying to say? _? What was his mood at that time? Who can talk about these three questions? Thank you!

I don't want to explain anything, but it's because I suddenly remembered those things in those years. Of course, the person I'm going with may be my favorite or my girlfriend. It was sweet at that time, but it was over and a little sad. But I can't forget that memory, so it's a fairy tale from the past and the title of that song. Yeah, that's right