Sometimes you will never know the value of a moment, until it becomes a memory and when its already becomes memory and you don't have any power to changing it or even to turning back times.
All thing you can do is just regret it and all you can do is mourned it and you totally useless and you just totally lost after what you did and you can forgive yourself because of it.
So that's why many people say you should value every moment that you got with your partner or part of your family because every moment is priceless and when you already lose it you even can't pay with money to get back that moment.
So, no matter is good or bad moment you should value it because every moment has a different utility for your future live and it will be changing your life forever if you can value every moment that you got.
Thats what I am trying to put in my life and my partner and we trying to value every moment that we got even sometimes he didn't do the same but I still do value every moment that I spend with him because I don't want to regret every moment that we had together.