be perfect to a fault

To be so completely or utterly perfect, especially to the point of being excessive or problematic. My boyfriend really does think I'm perfect to a fault—which is actually pretty irritating. I just want to be a normal human, not some goddess on a pedestal! If you think that every report has to be perfect to a fault, you're never going to get anything else done. I'm amazed she handed her paper in early—normally, she works on her papers right up to the deadline until they're perfect to a fault.