It's not like there are any other interesting Natural Disasters looming on the horizon for Clark to worry about or to interrupt him telling Lois what exactly it is he wants to talk about, right?
Oh, trust me, he will always find a reason to postpone it.
He had opened his mouth to confess that he, Superman, was also Clark, but then had decided that hadn’t been the time or the place for that confession. Her love for him was so new, so delicate; he didn’t want to risk damaging it by revealing his deception just yet,
Told ya.
At first he wouldn't tell her the truth because she didn't love him as Clark. Now he won't tell her the truth because she loves him as Clark. She is damned if she does and damned if she doesn't. He won't tell her anyway.
The more he prolongs the lie, worst it will be when she finds out the truth (because I don't believe he will tell her any time).
Andreia