I Will Always Remember You (Completed)

I have read many sidneet fanfics before but I am writing for the first time.
This story is about two best friends who got separated but both fell for each other.
When the boy came back after years if the girl has already died. What the boy will do?
What if a pure girl come in his life with a past like him. If they both had the same post. If they both know each other.