Seeing Lois felt like a breath of fresh air for Clark.

they are together. We are doing our last hurrah of happiness.
She didn’t seem at all like her usual confident self, though.
I wish he would focus more on why this is.
blaming the fact that she had left her watch at home

No watch.
She had said in her message that something had gone wrong in one of her investigations and that she had wanted to talk to him about it.
Clark, focus on what she wants.
It couldn’t have been that bad, could it? She would have mentioned something over the phone when they talked during the last few days, wouldn’t she have?
Not if she thinks her phone is bugged.
If it had been that important, she wouldn’t have left it up to a couple of cryptic messages, would she have?
They really need to get secure email accounts that they can send each other messages on.
He should have come home to check on her.
Yes, yes he should have. Which in some ways makes Lois's anger at him even less understandable. She is mad at him because he did not run to her when she called, but she has gotten mad at him so many times for it, he is trying to do better.