Thank you all. I feel better to hear that my anxieties are reasonable. Its bad enough having the boundaries of trust tested without being put in the role of obsessive posessive husband. I have now been invited along on the trip. Which is fine until the next time. I think my stand may be that we can be friends as a couple with him and his wife as a couple.
that takes care of this trip, how about the excessive emails, letters, phone calls, etc.? the quasi non-existent sex life? the disconnect between you and your wife and the fact that you don't enjoy a lot of the activities and interests she has (and vice versa)
I'm assuming this isn't the end of your problems?
As for this trip, Did she invite you or did you bring it up to her?