Why do we show remorse ?

We show remorse and feeling to many things in this life. Such as death, this brings many of us to a flashback or heart aching pain of losing a loved one. We've all experienced such pain in our lives but they've also showed us to love and care while we have the time. Every day is a day we are not promised. We aren't given another day by chance it's a gift, every day is a day for us to better and be productive in many abstract ways. This feeling of remorse we show is an on coming feeling we will for ever dwell upon in this life.