To some of this you becoming a single guy now? All of them....you want to buddy the guy next by you, when whomever being moved in the phase, saying 3-5 years, you calling each other.

You meet once 3 -5 years, and talk about something like the remembrance of something or update each other what the life you did in that overal scope. Each of your pair up, did something a little bit more near this classroom, 3 to 5 years one time traveling + a table eating bill, that is not a lot of money. 

You don't need to be close, get tired of all this stuffs. But you need to have someone whom remember some of this, not all bundle, but saying you know which one of them. You make a line app, or what chat, or the individual name to that Line App. When the times come, or the future, as a classroom, you will have some of that to lean on.