I expected she wouldn't believe him. She's got too many defense mechinisms. And they've been through too much.
Quite frankly, Clark saying "I love you Lois. I can't live without you. I want to be married to you." (Which is essentially what he just said in the previous chapters.)should not be responded by Lois saying "That's great! I love you too! Let's live happily ever after!"
It's too trite.
Much as Clark had a lot of emotions to work through when Navance died (which is why he didn't jump into Lois's arms), Lois has a lot of emotions to work through now as well.
She wants to believe Clark, but is she REALLY ready to open her heart up to him?
And even if she DID believe him, I think she would be VERY hurt by his behavior the last couple of years.
Now, from my perspective, as I have said before, MOST of Clark's behavior is justified. (With the execption of not wanting to tell her about his origins and wanting sleep with her just to get back at Lana. Oh, and he told too many people about Navance without talking to Lois at all.)
But from Lois's perspective, it doesn't change the fact that she loves Clark and he has, in many ways put her through the ringer. She needs to get over that. Real love is about forgiveness, so I'm sure she will eventually. But it will take time.
And I'm glad Lois has apparently told Clark she isn't going to sleep with him anytime soon.
Sex is an expression of love, it isn't a way to "prove your love." So Clark shouldn't have to do that.
And from Lois's perspective, there is probably a part of her that wonders if he wants to stay with her for "fringe benefits", even though he promises otherwise. She needs him to prove to her he REALLY is in it for good before she trusts him like that.
P.S. Is UP going to be like "Learning to Love", where Clark has to wait forever to sleep with Lois again? (Not that I think that premise was a bad one.)