Unchecked insecurity can ruin relationships and transform otherwise rational people into jealous monsters. When redditor u/abarbiegirl2021 changed her phone's background and home screen wallpaper to an image of Willem Dafoe as Klaus Daimler from The Life Aquatic, she didn't expect her husband to feel strongly about it. On the contrary, he was pretty upset. When taking her story at face value, u/abarbiegirl2021's husband seems totally unreasonable, but let's be honest—don't most of us have the p…