Well in the actual Greek tragedy, Oedipus doesn't know that he killed his father and married his mother at first. He had left his home many years prior because the gods had told him that was his fate and he had tried to run from it, but he wandered for too long , got lost, and inadvertently ended up back home and didn't recognize his parents anymore since it had been so long since he'd seen them. When he and his mother both learn the truth at the end, his mother kills herself and he gouges out his own eyes and starts wandering again.