yar it vary ge ent it lik to da spider
Because he stops believing in himself and that causes his abilities to weaken until they are no more.
Doctor Octopus
Because Peter Parker was starting to not believe in himself as a superhero anymore and that caused him to lose motivation at handling his abilities.
It was doctor octavious
In Spider-man 2 Doc Ock goes in the the water and carries the bomb to the depths saving the city plus sacrificing himself. It wasn't a bomb it was a fusion reaction.