Harry was reborn and became Severus' younger brother. Unfortunately, his eyesight was failing and his body was weak. Harry had always loved Severus silently and lived and studied with him. He knew that he occupied an important position in Severus's heart, but he also knew that he had always loved the girl with green eyes and red hair, the sunny girl! This is something you cannot change or replace.
What should Harry do, wish him happiness or strive for it? If we fight for it, how should we fight for it?
Harry's rebirth is the rebirth of love? Or is it just a senseless farce? No one knows.