Did he really change sides? Yes.
Did he finally help Harry? Yes.
Was he evil? Yes.
Did he hate Harry? Did he try and made him miserable? Yes.
(Another reply) This is a spoiler; you may want to read all the books first! While Snape had a very unpleasant character, it is clear that he is faithful to Dumbledore. Harry Potter tells one of his sons, Albus Severus Potter, who was worried about the possibility of being selected for House Slytherin, that he was named for two Hogwarts headmasters, that one of them was a Slytherin, and that he was one of the bravest men Harry had ever known.
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To keep Harry safe because Harry's mother was Snape's best friend. He doesn't want her death to go in vain
Plus: he wanted to make his students (Harry, Neville, Hermione etc) suffer -- it was something like a revenge in his twisted mind, for his own having been bullied by the Marauders.
yeah pretty much. He's the half-blood prince, and he killed dumbledore. . . long story short - he's on voldemort's side. actually, no. he isn't evil. he was working for dumbledore.
Snape's motivation is his love for Lily Potter, Harry's deceased mother. And his hatred for any male Potters. And his guilt. Etc.
He believed that this way, he - Voldermort - will get the Elder Wand's allegiance.
Snape's true motive is to avenge Lily. He wanted to keep Harry safe for her and wanted to see the fall of Voldemort and the Death Eaters.
professor snape
Professor Snape was once a death eater. Once he realized Lily was in danger he switched sides.
Professor snape doesn't like dolores umbridge because he wants to be headmaster
He thinks Snape is an evil git.Of course his theory is right, but it is not the complete truth: Snape is not just an evil git, but also the person who is told Voldemort the prophecy.
Snape is a rotten bully.