Years ago I was in line to check out at a department store and a man came up to me and said "Hi! We used to go to junior high school together. We were inseparable. Best Friends! I lost track of you when you moved away. Tell me everything."
His face rapidly moved from joy to confusion to anguish as he realized that I didn't recognize him.
In fact, I had no idea who he was. He obviously did know me. I believed him that we were buddies in junior high. Realizing that made me a bit sad that my weird memory had cost me a part of my past, but what really got me was the pain in that man's face.
I discovered a few years ago that I have a ... well a neurological difference. One manifestation of that difference is a weird memory. I can remember some things, I can't remember others. It doesn't seem to matter how important the remembered events, things, people were. Maybe I remember, maybe I don't. It doesn't really hurt me, except for a vague sense of loss. But it obviously can hurt others.