Originally Posted by John Lambert
That is totally junk. He knew he slept with Lois, but did not bother to see what the consequences would be. He just is too much up a wimp to face up to it, so instead he runs off to Krypton to avoid facing his responsibilies, including the one of telling Lois who he really is before he sleeps with her.
No, when you don't know you're a father you don't know you have responsibilities and therefore you cannot "run off" to avoid something you don't know is there.
And about him telling her he's Clark... did you ever see Superman II?