Free advice to the groom: Flee this ungracious harpy while you can. Unless you have surrendered every vestige of your manhood already, you will have a hell of a life trying to keep this infantile attention freak happy.
Were I a friend or relative receiving this invitation, I would respond with regrets that we will miss the production. (So what church hires out its house of worship , provided by people of faith, to become a venue for narcissists?)
sometimes it is more a question of budge rather that causes this. It is akin to excluding unmarried “plus one”’s