She manages to smile despite how inappropriate it is for the situation. She's practiced that whole 'puppy dog eyes' look and has it perfect because she's betrayed him so many times she's learned how to look innocent. She may appear innocent, but she hates him with a passion. I'm guessing he means if he'd seen what was going on earlier (like maybe her cheating), that it would have been different. Or maybe if he'd seen who she really was, it would have been different. It's so tense that the atmosphere is just a black fog. Neither of them is actually doing anything, and it's just all going to hell.
She manages to smile despite how inappropriate it is for the situation. She's practiced that whole 'puppy dog eyes' look and has it perfect because she's betrayed him so many times she's learned how to look innocent. She may appear innocent, but she hates him with a passion. I'm guessing he means if he'd seen what was going on earlier (like maybe her cheating), that it would have been different. Or maybe if he'd seen who she really was, it would have been different. It's so tense that the atmosphere is just a black fog. Neither of them is actually doing anything, and it's just all going to hell.