Why does The Green Goblin want to torment Spider-Man so much?

So if you’ve watched or read anything Spider-Man related then you know if his infamous archnemesis, The Green Goblin who’s real name is Norman Osborn, the father of his best friend Harry. Norman tried to test a serum designed to enhance his physical ability as well as healing factor and intellect. This lead him to becoming insane and developing on obsession with tormenting Spider-Man. Unlike his Carnage who doesn’t care who he spreads chaos too, Kingpin who wants wealth and power, and Doc Ock who wants to prove his intellect. The Green Goblin only wants to make Spidey’s life a living nightmare. The most infamous example is in The Amazing Spider-Man #121 where he throws Gwen Stacy off a bridge. Spidey tries to catch her but the sudden stop snaps her neck. This time, Spidey would actually try to kill The Goblin. And he nearly succeeded until he realised that would’ve made him a murderer like Osborn. However he was killed by his glider. Norman’s son Harry also donned the mantle. Now if you’ve read all that then I wanna know why this green freak who flies around on a glider keeps intentionally making life difficult for Spidey and shows absolutely no signs of stopping
Why does The Green Goblin want to torment Spider-Man so much?
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