James ( Harry’s father) made fun of him at school and James stole Lily (Harry’s mother) from Snape who loved very much
Lily Evans and James Potter. I'm obsessed with the series. :)
Yes, Severus Snape stood for everything James Potter hated and he was also the best friend of the person James' loved.
'Snivellus' is a nickname for (Professor) Severus Snape, and was used regularly by his school rivals James Potter and Sirius Black when they were boys.
No. They hated each other.
His name is Snape.
Dumbledore (or possibly Lupin) tells Harry the story of James Potter saving Snape in the third Harry Potter book, I believe.
Yes, Snape went to the Potter's home in Godric's Hollow to find both Lily and James dead, but not Harry.
Because Gryffindor and Slytherin are rivals and Snape did not like Sirius' friend, James Potter. Also, Sirius and James targeted Severus as someone to humiliate throughout their school years.
No, Snape is the half blood prince. His mother's name was Eileen Prince, who was a witch, and his father, Tobias Snape, was a Muggle. In Harry Potter and the Half Blood Prince, Snape admits this to Harry.
Because Snape hates him! or at least it seems that way. There are many examples of Snape going out of his way to make things hard on Harry, he subtley makes fun of him and his friends (the worst one, in my opinion, was when Hermione's teeth gets cursed to grow 10 times their normal size and when Snape is notified says "I don't know, she looks the same to me.") , and he takes points from griffindore for seemingly no reason-- I would hate him too! Another reason is that his father had a long going rivalry with Snape when they were in school together, though rivalry may not be the right word. James was popular, Snape wasnt and was often picked on by James. Harry finds out about this in the 5th book but still cant seem to trust Snape.
There are many reasons. James Potter and Severus Snape both loved the same person, Lily Evans. Lily hated James but was friends with Snape until her fifth year. She began to date James in her seventh year after he grew up a little. However, both were very jealous of each other. James also hated Snape because he was a Slytherin and supported the death eaters.
Severus Snape never maried in the Harry Potter series. He only ever loved Lilly Potter, but she married his arch nemesis James Potter. The actor Alan Rickman who plays snape in the Harry Potter movies is also unmaried and has never married, but has been in a relationship with one woman for forty years.