I hate that phrase "We lost our friend/spouse/whatever" when someone dies. I hate euphemisms like that. It's just a way to pretty things up, to blunt the truth. You don't just 'lose' people - they don't just disappear into thin air. We don't misplace a person like we misplace our keys or important papers.
But death is so harsh, isn't it? So final to most people. So unforgiving. So harsh. So we use pretty phrases to comfort ourselves, to comfort others, to make ourselves feel better and distance ourselves from our own death. Because it intrudes into our little bubble, our own little fantasy world that we have built up and don't want destroyed.
But there is an objective truth to what happens after death - either you believe that death is the end, or you believe that death is the beginning.