On the outside of the envelope, in the familiar block letters of the anonymous note giver, now known as Lois, was written “Chuck”.
Even if there was nothing inside the envelope itself would have helped him.
Clark knew now that Lois loved him.
I'm glad he fully accepts this.
He had stared at the note every night since, debating whether to read it, and always ended up falling on the side of ‘not’.
I would have read it out of sheer curiosity.
He had come to this dimension to meet, fall in love, and live happily ever after with Lois.
I think "fall in love with" would work better here.
She had most likely written things that she now regretted, at least he hoped she regretted.
This seems to be true for the opposite of the reason he suspects.
He missed their late night phone calls to say ‘good night’.
Those were fun, even if there were far too few of them.
Clark hadn’t acted this paranoid since Tempus revealed his secret to the Metropolis during the televised mayoral debate.
I think "secret to Metropolis" is what you want to say here, unless you want to modify Metropolis with another word.
