It wasn’t how he planned to tell Lois that he was Superman,

I thought he already thought that she had figured it out during their regain-memory kiss before he flew off to Nightfall 2?
“Don’t you know if you pleased me? Wasn’t that important on your to-do list in your fantasy?” she asked, her gaze narrowing.
He took a deep breath and stepped back. “I came here tonight planning on breaking up with you, but I can’t… I just can’t do it. I’ve worked too hard to get to this point that I can’t just throw it away.”

Michael