I have to admit, I'm one of those people who don't think Clark would sleep with Lois without being honest with her, particularly considering how he describes making love and also the fact that he can't be 100 percent sure the act wouldn't be different with him than with a human male, so I'm not sure what I think about that.
The rest of the chapter was just as confusing. I still think something more behind the scenes is going on. Obviously, he feels bad about having her think he was dead, but the change started way before then on the park bench. So, this piled on top of whatever else happened--and we still don't know if he got stuck in the Kryptonite cage--may be what convinced him or forced him to drive her away.
I love how even through her view, we can see how much of a constant effort it is for him to distance himself from her. Being close to her and trusting her is very natural to him.
Oh, and I love that in the flashback, she thought that she had to live to honor the gift Clark had given her--beautiful!
