I'm with Perry here. I was wondering, why Clark hadn't exploded before now. But I think this was just the perfect moment to blow up in Lois' face. Now, she got a taste of her own medicine. It really wasn't fair of her to expect Superman to treat her like he always has.
I really like this chapter, because it's a turning point. Up until now, I always thought that Clark would forgive Lois, if only she asked him. Now, I think there will be a lot of groveling involved. Perhaps more than she could possibly imagine. My guess would be that her first attempt to reconcile will backfire, and painfully so.
