Great post! I've had similar experiences in almost ALL my friendships, but I've never admitted it to myself because aren't really really good relationships supposed to last a lifetime? Well, they never did, for me. I've resigned myself to keeping friends while we spend lots of time together and can relate to one another, and then letting them go when the time comes.
In a way, keeping friends past that--i.e. visiting each other once a year and realizing how much you've both changed, that you aren't that close anymore, etc.--is even sadder than just going your own separate ways. Plus, I'm not sure how to put this, but I think we get more selfish as we grow older. Or not selfish, rather, but our lives just become busier and we don't have time or room in our hearts for maintaining long distance relationships.
It's sad because I've always wanted those sorts of life-long relationships. I kind of agree with SarahGM in that it has a lot to do with your own perspective and how your relationship develops from the very beginning.
Btw, great thread, Ithilia. I think making friends in med school will definitely be difficult, and spending time with a bunch neurotic med students doesn't sound appealing to anyone, BUT I think it's so important to have a close group of friends you can commiserate with and see on a daily basis. I don't know about you, but it's impossible for me to attend school near any of my current friends, and talking to them about med school admissions is revealing enough of the support and understanding (or lack thereof) that I should expect from them in med school. NO THANKS! I'll take fellow neurotic med students any day.
Oh, and you should know that loneliness is not exclusive to med school. Many of my friends are now complaining about the loneliness and isolation they feel in grad school/ work. Oh, is this the "real world" of grown ups? 😱