General Zod: I win. I always win. Is there no-one on this planet to even challenge me?
[Superman stops the falling elevator with Lois on the underside of it.]
Superman: I believe this is your floor.
Terrorist: I hope you have not many sins left to be forgiven, because if you let go of that, you'll only have sixty seconds to list them.
Lara: If you intend to live your life with a mortal, you must live as a mortal.
Lois Lane: Once a girl's seen Superman in action, Niagara Falls kind of leaves you cold. You know what I mean?
Sheriff: Dwayne, you've gotta learn to kick ass if you wanna be a peacemaker.
Lex Luthor: North... Why does he always go north?
Otis: He wants to ski?
General Zod: Crude noisemaker.
Lex Luthor: Why didn't you go before we left?
Eve Teschmacher: That was two days ago.
Lois Lane: I'm gonna' be fine. Don't worry about me.
Clark Kent: I like worrying about you.
Willie: Please, Mister.
Ursa: He's a General.
Willie: Please, Mister General! Please let my daddy down.
Clark Kent: I have to go back.
Lois Lane: You can't go back, there's no way now.
Clark Kent: I have to. I've gotta try dammit, I've got to try something. Anything.
Lois Lane: It's not your fault. You didn't know this was going to happen.
Clark Kent: They knew. I heard 'em. I just didn't listen.
General Zod: Why do you say this to me, when you know that I will kill you for it?
Answer: Superman was be able to kiss Lois in such a way that the heightened emotion wiped out her memory of his identity. To answer your second question, even though Lois promised not to tell anyone, Superman decided he does not want even her to know his secret identity.
Matty Blast