He never truly became Voldemort's friend. He was only staying close to him to collect information to protect Harry and avenge Lilly.
No. Lord Voldemort killed Severus Snape's true love.
Voldemort didn't know Snape had changed sides, Snape was a spy.
Voldemort ordered his snake, Nagini, to kill Severus Snape.
He always thought he controlled Severus Snape and had no reason to fear him. The only person Voldemort ever feared was Albus Dumbledore.
No, Severus Snape is helping the Order of the Phoenix to bring down Lord Voldemort.
Faster than severus snape confronted with shampoo
Voldemort, obsessed with becoming the master of the Elder Wand, ordered Nagini, his serpent, to kill Snape who he (Voldemort) thought was the master of the wand. Because the Elder Wand gives his allegiance to the one who killed its master, Voldemort thought he had to kill Snape to become the true master.
Severus Snape's father was a muggle and he always fought with Snape's mother. This led to Snape hating his father and therefore muggles. So he believed what Lord Voldemort believed and signed up to help him.
Snape becomes headmaster because he is the best pawn that Voldemort has at Hogwarts school. Snape accepts the job to further his work and to afford the children what little protection he can without giving away his cover.
Lord Voldemort believes that Snape is the true master of the Elder Wand because Snape killed Dumbledore. In order to gain the wand's allegiance, he kills Snape. However, Draco Malfoy disarmed Dumbledore before that, so Snape had never been the true master.
In the end, he's loyal to Dumbledore.
He is a hateful evil bully, who willingly joined Voldemort.