She was simply going to have to prove to him that she was worthy of his trust.
Clark was strongly attracted to her. That part had been obvious for months but she had chosen to ignore the fact. The trouble was that she liked Clark. She liked him a lot more than was safe for her peace of mind. Superman, on the other hand, was obviously well beyond the reach of a mere mortal woman. It had seemed safe to love him ... only now that was manifestly not true. Her hero was a man like other men in all the important ways. Oh, he still had all the wonderful powers and the ethical code that she admired, but now she knew that he had the flaws as well -- and worse, that he was strongly attracted to her. There were times when she suspected that there was a lot more to it even than that. In any case, he was no longer out of reach. Maybe, she thought, that was why she had refused to see the obvious until her nose was forcibly rubbed in it. If she had admitted to herself that the coworker who was her best friend was also the hero that she dreamed of, she might have had to make choices that she would rather avoid. A mortal man made mistakes. A mortal man could hurt you terribly if you gave him your heart.

Great introspection!
He reminded her suddenly of a puppy that wasn't quite sure if it was going to receive a pat on the head or a kick.

I love Lois' introspection and how she feels it dangerous now to fall for Superman because he *is* attainable. Her apology is sweet, I just wonder what Clark was thinking at the time. Must have shocked the heck out of him and warmed his heart at the same time.
Sara