No.
It was assumed Olivia and Victor were burned to death at the end of Chick Cancer but she appears again alive & well in the first episode of the fifteenth season, The Boys in the Band.
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No, Brian did indeed kill the evil sadistic clone but the 'Thriller' inspired ending was to indicate that there is still a little bit of evil in Stewie and he hasn't gone soft.
He's never had a proper girlfriend but you might be thinking of either Janet from "Dammit Janet" or Olivia from "From Method to Madness"
he asked a question only the real stewie will know
That would be Stewie Griffin: The Untold Story
steie is intelligent enough to be able to read and create complex lasers yet his mind is still uncorrupted. in the episode where he marries Olivia he is still unaware as to what sex is.