2. Your experience has increased. You have grown from an ignorant teenager to a sunny teenager today. You have experienced more and seen more, so you don't care about the handsome in that memory.
3. Values have changed and aesthetic standards have changed. Therefore, the former handsome can no longer meet the current emotional needs. What used to be excellent is better now. It turns out that handsome people are not only attractive, but also more valuable. As a result, he was handsome in high school, but ordinary in college.