I never think it’s a good idea to hang out with people just because it’s convenient. For friends, you’d like to exert at least some effort to meet. When you catch up with old friends whom you haven’t seen for a while, two things can happen. You either find you don’t have much to say to each other anymore, or you feel that the day you hang out together is just like yesterday.
One inevitable thing to do when old friends meet is to exchange / update information about other common friends. Interestingly, you are surprised by some of the things that you hear, but at the same time, you aren’t. It makes you wonder: maybe other people do know you better than you do. Something may be a total surprise to you, but actually a meant-to-be to others.