Things end. That's a fact, and you have to accept it one day or another. Life comes in phases that begin and end, which is why death is so significant to us - it's the biggest reality that we have to face. But the thing about phases is that it is exactly what it is. A phase. It may end, but another phase will be sure to begin soon after. So there is no point of being disappointed, or unhappy if something is over - in fact, you should be excited, because it means that something new is just about to begin.