I could pick out one of several friendships from my childhood and, even, one or two acquaintances I’ve made through work. For whatever reason, people seem to disappear from my life once that common ‘thing’ (work, college, etc.) has ended. It doesn’t matter how I may feel about them as a friend and, how much I may wish to stay in touch; it never seems to happen.
Even re-connecting with people through Facebook doesn’t make any difference.