Princess Celestia has met many individuals whom she could call friends during her life. But given the fact she does not age like they do, she cannot bring herself to be there when they pass on. Still grieving after being forced to banish her own sister to the moon, she cannot face the prospect of losing those close to her.
Anthony, however, is the last human in Equestria; he is also the next to go. Now Celestia is determined to face her fears so she can be with him at the end.