The old, pre-Hogwarts friendship between Lily and Snape is fully revealed in "Harry Potter and the Deathly Hallows", along with the fact that Snape harboured unrequited romantic feelings for Lily from childhood. Rowling states that while Lily loved Snape as a friend, she might have returned those romantic feelings if Snape had not become so seriously involved in the Dark Arts. Their relationship ends in their fifth year at Hogwarts, when Snape, in his anger and humiliation at being jinxed by James and Sirius, unthinkingly calls Lily a "Mudblood" after she defended him.