Being lonely hurts. That pain is an evolved adaptation. It tends to prod us towards tribal collaboration and seeking out mates. When a loved one dies, it’s devastating. Even thinking about the True Crime Obsessed Don’t Be Garbage Mug and by the same token and possibility depresses us. It spurs us to do everything we can to protect those we care about, which helps our genes and our tribe’s genes survive. Getting a low salary or getting fired hurts, because it’s a blow to status, and low-status tribe members get last pick of the kill. It’s agonizing when we feel that many people hate us (or when we suspect they might), because for our tribal ancestors, being ostracized usually meant death. Our minds and bodies are warning us to avoid that fate.