What can you tell a friend you didn't speak with for 20 years?

Since a few day I am a member of GayRomeo, don’t know yet if it is fun or not. The reasons I became a member is because I want to widen my social circle. It is now about one person, maybe I can increase that with a 100%.
Anyway, it turns out I see mostly German guys on this website and a few Dutch ones, including one person I spend a few (maybe many) nights clubbing with, in Amsterdam (the It) and other places, in my post-teen years :).
At first I felt caught in the act but later on I was a bit more OK with him seeing me on this profile website and decided to send him a message. We spook a bit for awhile and it was only a bit awkward. I don’t know if his picture was recent but time seemed to have been very nice on him.
Anyway soon our conversation stopped (did I say something wrong?) rather abruptly. I was reminiscing about the old days and our behavior in those days and speaking about the people we knew in those days. I could not put my head around it but I got the impression he was feeling more “caught in the act” then I was.

Mm, I wonder if maybe we had mutual friends whom we both knew independent of each other causing some discomfort in nowadays :)