See, I told you Clark didn't do so bad. He came clean, and then proved his sincerity and his love by making himself completely vulnerable. He probably shouldn't have left when he did, but, hey, that's Clark for you. At least he made it clear he wants to continue the conversation as soon as Lois is ready.
Lucy seems to have helped Lois clear her head and realize what's important. Now, we just need Lois and Clark to get together and be completely honest with each other.
One point: I don't think Martha would (or should) have openly said over the phone that Clark was Superman. I think she'd have said he decide to become "you-know-who" or "that other guy" or something like that.
When do we get Part 5?
