Sometimes we don't worship the things surrounding us, and yet when its gone we start caring. This happens so many times, times we sometimes aren't even aware of. Its not always a bad thing, I am myself for example a person who lives very much in the moment, and I admire this quality of mine, not worrying about the future to much, no bad thoughts crossing my mind.
But at times the package of 'life' comes with some tough and harder stuff as well , and this is the part where you have to learn how to deal with the sudden rush of weird feelings of pain, you usually don't have to deal with. All things eventually come to an end. This is where we have to remember to again live in the moment and just simply and roughly remember the past as something that will stay in the past as a bunch of good moments.