Clark's never been all that bright about personal things. As mentioned above, there's no way Lois would start sleeping with someone else before his body got cold in the ground. How it never occurs to him that he has a son is baffling.
SQD, thank you for not making Lois, Luthor's wife.

And make Clark wise up. Nine years in Purgatory have atrophied his brain. I'm very much looking forward to Part 9. So roughly how many parts will this story end up being?