It is, but only after he's lied to your face five times or more, even after you've made it clear that you know he's lying, and he continues to do it - basically insinuating that you're an idiot in the process. He comes clean when he literally cannot lie any more, and your only options are to act surprised that he's been lying to you this whole time (in various ways with various outcomes). It's infuriating.
