Who is responsible for Oedipus' suffering? Is it Oedipus himself or his fate?

People have been debating this issue for centuries. You are correct in saying his fate was sealed, but it is important to remember that Oedipus made his own choices. He was not responsible for the death of his father because Laius ceased being his father when he sent him away to die. He is not responsbile for his subsequent marriage to his mother for the same reason. Oedipus did, however, take his own sight and in doing so, he instigated his own downfall.