First off - Hi ya'll and Welcome to the board!!! Secondly - I think honesty is the best policy here. If ya'll are good friends, then I think they will appreciate your honesty. Just tell them what you think and the signals that you are getting from them.
Having said that - I think that if they are planning something and not including ya'll in these plans - I would tread carefully with this friendship. Friends just don't do this kind of stuff, IMO.
We are glad to have you here on the board though!!! Since you are just getting started - here are some links for you to check out that might help make the journey a little easier......Swingers Advice, The FAQ's, and the Getting Started Forum Check out the old threads, if you have a question that doesn't look like it has been answered - please ask. There is always a helpful "veteran" out there to answer for you.
We hope that you join in the discussions so we can get to know you better
Jenn and James