I've just begun to appreciate the many different kinds of friendships there are. There's the friend you talk to and laugh with every day of the week; the friend whom you don't talk to for months on end but when you do talk everything's perfect and like it always was; the friend you make because you're in the same situation [and it's not like you don't appreciate them for just being there because, frankly, you need all the friends you can get and they're pretty awesome people in their own right, but when you're not in the same situation anymore you don't stay in contact, and that's perfectly fine as well, just because you've either grown up or moved on doesn't mean the friendship wasn't real while it lasted]; the friend you miss with an acute pang when they're not around; and the friendship that's like a Gaussian beam - you're just slowly outgrowing each other [the worst part's when it's not lengthy silences where no one knows when to speak up or what to say, it's not wanting to hear anymore what the other person has to say].

Just let go and move on.