I need Facebook-stalker advice, and I'm the stalker. Should I give full disclosure or wait it out?

[pri✍]

As soon as the other guy (say B, a he, for easy reference) accept your friend request, depends on B's setting whether keep his friends list to himself or not, if not, then automatically it will be shown to others. Now whether the first guy, the main figure in your story (say A) see it or not, that's another story that we don't know for sure. But as you unfriend B, your name will no longer in B's friends list; but still, during that said period you befriend with B, A might see it.