Summary. As a character, Severus Snape was often misunderstood. Many believed he was a villain, and weren't convinced he was actually working for Dumbledore. Snape killed Dumbledore in an effort to protect Draco Malfo and spare him from the emotional trauma of murder.
However, Draco was ordered by Voldemort to kill Dumbledore. Lestrange saw this as an opportunity to test Snape's loyalty and while making this vow to always watch over Draco, Lestrange forced Snape to agree to killing Dumbledore himself in case the youngster was unable to do so.
Snape Would Never Have Gained The Elder Wand's Loyalty (Even Without Draco) Dumbledore knew that he couldn't allow the loyalty of the Elder Wand to fall to Voldemort, so he developed a plan. He told Snape that he must be killed at his hand before the curse took his life.
Albus Dumbledore's relationship with Severus Snape showcased an unusually strong trust and loyalty. While many characters questioned his intentions, Dumbledore consistently trusted Snape and defended him. However, the extent of Snape's loyalty to Dumbledore was kept between both of them until their deaths.
Voldemort told Snape he had been a faithful servant, but that he had to regrettably kill him, as he mistakenly believed he was the master of the Elder Wand, as Snape had killed Albus Dumbledore, its former owner the year prior, during the Battle of the Astronomy Tower.
Why Dumbledore Pleaded with Snape Before Death - Harry Potter Explained
Did Dumbledore intend for Snape to kill him?
While conferring with Snape about the inevitable outcome of this curse, Dumbledore also asks that Snape kill him when the time is right. Not only would this protect Draco from irreparable harm, but it would ultimately prove Snape's loyalty to the Dark Lord during a critical time.
However, near the climax of the book, Snape leaves Harry his dying thoughts (to be viewed in the Pensieve) and ultimately reveals to Harry that he had been loyal to Albus Dumbledore throughout the series.
His father was neglectful and sometimes abusive, which may have contributed to Snape's disdain for Muggles. At some point during his school years, he decided to reject his father's name entirely, giving himself the moniker "The Half-Blood Prince" with his mother's maiden name instead.
He hid them using the only thing that would work against Voldemort. He used Fidelius charm and after that even secret keeper was to be protected using that as Sirius said in PoA. The plan failed because wormtail who was their secret keeper betrayed them.
Why did Snape stay loyal to Dumbledore after Lily died?
But when Lily's life is directly threatened, he has to make a choice, and he chooses to stand between Voldemort and Lily. To do that, he aligns himself with Voldemort's chief opposition, Dumbledore, and becomes his spy. Even after her death, he remains at Dumbledore's side at Hogwarts and vows to protect her son.
We all know that Snape was a good guy after all, and had good intentions, even though he despised Harry and James. He even was mad that Dumbledore said that Harry would have to die. He probably did cry after he killed Dumbledore.
Dumbledore was dying of a curse set by Voldemort, and only had a few weeks to live. If he died of the curse, that meant Voldemort had killed him and would get the mastery of the Elder Wand. If he killed himself, there was a possibility the Wand would still interpret that as Voldemort's victory.
He concludes that, because Snape killed Dumbledore, the Elder Wand belongs to him. Voldemort knew he couldn't cast Avada Kedavra with the Elder Wand to kill its master. Voldemort had to kill Snape because he needed the wand's allegiance to switch.
So, during the summer between his fifth and sixth years at Hogwarts, Draco Malfoy was tasked with the assassination of Albus Dumbledore to restore his family to Voldemort's good graces. Also at this time, Draco was branded with the Dark Mark.
He promised to protect Draco Malfoy from harm and guide him whilst he attempted to perform the task the Dark Lord had asked him to do: to kill Albus Dumbledore. Snape was actually a double agent working for Dumbledore, who requested Snape to kill him anyway to spare him of a painful and humiliating death.
In his fifth year James saved Severus Snape from a near-fatal prank that Sirius Black played on him, which involved luring Snape to the Shrieking Shack where Remus Lupin was in his werewolf form.
The movies follow the books closely enough that they aren't really separate universes, except for the fourth movie. There isn't any truly compelling evidence that Snape is Harry's father, because all the points you raise are explained. Snape hated Harry because Harry reminded him of the man who "stole" Lily.
By Harry Potter and the Deathly Hallows, it's a stretch to call Draco a villain anymore. We just watched — or read — him struggle to reconcile his choices and morals in The Half-Blood Prince. He can no longer justify his actions, and is far more aware of the evil he was born and raised into.
Toward the end of the memory, Lily comes to Snape's defense, and he rebuffs her and calls her a Mudblood. This is effectively what ended their friendship for good, as revealed in the books, which is why it's Snape's worst memory, not that he was being bullied.
Originally Answered: In the Harry Potter series, why didn't Lily marry Snape? The simple answer: She didn't love him. The more complicated answer: He proved again and again that he wasn't willing to listen to Lily, respect her or her views, or love her in a healthy way.
Snape wasn't unrequitted, but he merely loved Lily in a puppy, childish way just the same way she loved him. He didn't mature his feelings until very late, as an adult, when she was already out of grasp. Remember what Rowling said when she was asked if Lily ever reciprocated Snape's feelings.
To defend her students, McGonagall casts a series of spells Snape's way, but he manages to evade all of them before flying away. But what McGonagall doesn't know is that Snape is actually a double agent working for Dumbledore, so he has no intention of harming her.
So, during the summer between his fifth and sixth years at Hogwarts, Draco Malfoy was tasked with the assassination of Albus Dumbledore to restore his family to Voldemort's good graces. Also at this time, Draco was branded with the Dark Mark. This killed two birds with one stone for Voldemort.
