Being friends or not

goood morning my pumpkins. Can somebody tell me why friendships should have ups and downs, coming and going, losing and refinding when they count years. Isn't it supposed that you know each other and you just build upon that? Why should we make steps behind instead of only front???It suckssss!!! There are times it's interesting but it definetely sucks most of it. We have other things to worry. Should we worry about friendships? It may be a sign that it's not a real one after all.  Real friendships have a base. That ain't shaky.