You guys are ridiculous again. I see the words "We were invited to a wedding", that means she was invited too. It is not in the power of the invitee to uninvite invited guests. You want to say that someone is not acting like an adult? Then I would say the person who makes an issue out of every little thing, who makes excuses when politely asked to schedule a talk, and who tries to uninvite an invited guest to someone else's affair, is the childish one.
Marriage, even a rocky marriage should not be a battleground. When his wife does go to a lawyer and seeks a divorce, will he say, "Well, some people who I have never met called Allen A and Maynard told me to act that way, so that's why I did it!"?