Is it normal to lose these type of things?

So nothing lasts forever however, what if you worked for it for so long and it finished in a shorter amount of time than you worked for it? I mean, I earned what I wanted but it didnt last as long as i expected. In general, its really hard to face our losses especially when they are so good but besides what i lost in particular, I know that things dont last forever. It is still hard to overcome the fact though that its not there anymore such as a glory of an athlete, or how our envrionment has gone from green to practically brown, or a death (popular one) even a loved one in a relationship or marriage where that spark dissolves and you dont know if to continue or not. Anyone have any thoughts about this topic of losing things and the aftermath? It would certainly help me cope better with my loss.