Mrs. Cox is given more to work with than just being window dressing.
She challenged, "Why her? Why Lois Lane? Why do you need her when you have me? Aren't I enough for you?"
Watch your step Mr. Luthor; Hell hath no fury like a woman scorned.
Clark choked out, "You'll never ... break her ... or control her ... soul." He thought, <Lois, what have I gotten you into?>
Poor Clark!
In an apparent non-sequitur, Luthor said, "Propinquity."
Lois was caught off guard, "What?
Luthor chuckled and said, "I thought you knew words. Propinquity. A relationship based on convenience. You work in a particular place, shop in certain stores, become attached to the people that surround you. But, when you move on, the relationships end." He smiled an I-told-you-so smile and added, "That's what you have to do, Lois. Move on. It's not fair to you ... or to me. How about your family?"
Yup, this is the true Lex. Totally into his own pleasures. What a fink!