So seriously, old friends are the best. Who better to talk to when you don't know who to turn to and you want something confidential. Most of my old friends . . . . all of my old friends aren't an every day part of my life right now so i know they can't spill any secrets of mine, not to mention you know you can trust them 100%. why else would they be your friend?
It can also be so refreshing to just catch up with them. It gets your mind off the sorrows of the day. If you have a friend you haven't spoken to in a while that you were close to once and you've just kinda read their facebook status here and there then you should talk to them soon and see how they are doing. It is great.
Also, try to get close enough to a current common friend that you trust and maybe they will in the future become another great old friend. boo ya