I was on my way to attend a concert. An ex-student stopped me and asked whether I can remeber her? I paused and replied no. She seem to be disappointed and walked away.
I have been teaching for many years, even for some students who I used to be closed, after some time, I might forget their names. So I felt that she needn't need to feel bad about it. Things around us do change and our lifes changed as days go by. So I asked myself: "shall I feel bad about it?" The answer is definitely NO!