Excluding half of a couple
[F]My wife has been invited by some of her friends (a couple), from before we were married, to accompany them on a one week vacation at their expense. I was not included in the invitation. They are aware of our marriage and, while not close friends, we have met.
I feel that it was rude for them to invite my wife and exclude me, without even the chance for me to pay my own way and when they didn't suggest this, I feel that my wife should have.
My wife says that this couple are her friends, not mine, and that there is nothing wrong with her doing things as an individual, including a vacation. She feels that there is no reason for her to have tried to include me, even though I am retired and have nothing planned.
I have tried to present both sides of this situation fairly. I feel that I have been deliberately excluded and that she and her friends have been very rude to me. Am I wrong? What is your opinion?