In Chapter 33 ( `` The Prince 's Tale '' ) Snape 's memories show that he loved Harry 's mother Lily Evans , but their friendship ended over his association with future Death Eaters and `` blood purity '' beliefs . In Chapter 33 ( `` The Prince 's Tale '' ) Snape 's memories reveal that he loved Harry 's mother , Lily Evans , but their friendship ended over his association with future Death Eaters and his `` blood purity '' beliefs .