Coming out

[rabbitsystem.livejournal.com]

There's a man who is a very dear friend to us, and we really want to tell him about us. But it seems to us to be a bad idea to do so because he might tell others. That doesn't strike us as likely, especialy if we ask him not to, and in a few days we're probably going to give in and tell him, because we hate lying and especially to people close to us.
Any advice regarding if/how we should do it? We communicate only by instant messenger.