EchoStalker
Vic meets a shy girl named Isabelle. She tells him that she's dealing with strong emotions and mental health issues, and that his band's music helps her through that. Now, Vic hears stuff like this all the time from fans - but there's something special and different about Isabelle. He knew she was going to change him in some way or another in the end.
The longer that Vic and Isabelle are friends for, the more he notices how much her mental health is affecting her, and maybe even himself too. It really hurts Vic to see her like this, a suicidal mess.
He writes a heartfelt song for Isabelle years later to honor her.
Little does Vic know, Isabelle has been trying to say goodbye to him for a long time - signaling in different ways. It was until now, he knew. He understood.
Then he gets the letter.