When I was at school, I had nothing to do but study, so I wanted to fall in love to kill time. There are many things to do after graduation, so I don't have time to talk to you anymore. What's more, maybe I didn't intend to take it seriously at all. It is also possible that students are in adolescence and it is normal to have a good impression on a certain opposite sex. I don't see each other often after graduation, and the good impression fades after a long time. Anyway, don't be too serious, so as to save yourself trouble.