Unreasonable Lily and the Consequences

AU beginning of 5th year. Even before the Lake incident, Lily becomes unreasonable and unforgiving as Severus was suffering because of her. By falling in love with James Potter and humiliating her once best friend with the help of James Potter and everyone because "he exists", especially all of the professors at Hogwarts, Severus Snape has mysteriously disappeared. Full sum in fic