Sure Lois was under a lot of pressure especially from Lex. However, while she let him down gently what makes us mad at Lois at least in my view is the way she blatantly made it clear to Clark just who her heart belonged to. Asking him to contact Superman for her was really not the thing to do after you just turned down someone who confessed their feelings. Also she treated Clark like all he had was a school boy crush rather than acknowledging the fact that he had genuine feelings for her.
While it's true that Clark fed into her fantasy more than he should have and to be honest brought the situation on himself she shouldn't have dismissed him so easily.
