grief definition: The definition of grief is a feeling of great sadness, especially when caused by a loss or death, or grief can describe being the cause of trouble for someone. (noun) An example of grief is what you feel after your spouse dies.
You never expect anyone to pass away and truthfully you really can't live your life where you spend every moment you are with someone as if they could die tomorrow. You're a human being and that's just not realistic. It makes for a great thought though.