liar liar pants on fire

Why is Sharon suddenly going off on Jack? What happened to that cutesy little speech she gave him when they were working at Restless Style? The one that went something like, "I know you won't stop lying, so I'll pretend I don't notice when you do"? Please. She knew he was a liar when she married him. Jack is just being Jack so why is Sharon acting like this is the first time she's seen this sort of deceptive behavior?