I have heard that phrase a few times from people and every time I see it, I roll my eyes. Why do they feel the need to say only marriage on there? Why can't they just say "I'm getting married" instead of "I will be having my first and only marriage"? I'm not divorced, but I'm going to bet that every divorced person out there went happily into their marriage. They didn't realize it was ending in divorce, which is why they got married! People just changed, or moreso became themselves
I know this is probably going to be a touchy or offensive topic, but I am really intrigued as to why people feel the need to say that.