the worst part is knowing that while he'll never forget her, she'll never be able to think about him again

Yes. That is the worst part. I can't talk to her or phone her anymore. I will probably never visit the town she lived in again. I always wonder what my grandma, my mother's mother, would have though of me if she hadn't died when I was 11. I tend to think life might have been much easier... we were alike in many ways.