I think the guys realizes hes doing wrong by cheating on her[well duh] and he cares about her too much not to tell her. So when it says "her concious calls the guilty to come home" I think it means that theres something about her he doesn't want to lie too, and when it says "her tears dont fall they CRASH around me" I think it means that other peoples tears don't effect him, but when she crys it effects him horribly. And he realizes that hes made too many mistakes when he says "this battered room ive seen before" so its obviously not the first time hes hurt her.