It starts out great: you promise to remain close and keep in touch. When you're miles apart, you promise to see each other every chance you get. Then one day, while sitting on the toilet, you realize that you haven't seen them in so long when before, thinking about being away from them months apart at a time was unimaginable. What happened? Growing up happened. Something one of my friends like to call "adult" (as in, the use of adult as a verb instead of a noun) happened.