history: My son is never here anymore.  He is growing up and going out with his own friends.  This is extremely healthy, but I certainly miss him and want him to spend more time here.
current: You hope your teens make the right choices, but sometimes even the right choices feel wrong.  He is choosing to be away with friends and not at home much.  I believe this is healthy, but I can help but want something different.
next: I know it is hard to start letting go, but it gets easier with time.  Don't worry, you are not alone.