So FI and I got an invite to a high school friend's wedding. The groom is much closer to FI but we all went to middle and high school together and FI and I were dating in high school.
The invitation said:
"Mr. FI last name and guest" <---They also used his nickname but honestly they probably didn't know it wasn't his real name haha
Good to know I'm considered "and guest" to my FI when we have been together longer than the bride and groom. I think the worst part is that they know me! I never realized the significance to finding out SO name's until coming here to TK.
FI was just like, "They didn't mean anything by it." All I said to him was, "Well, it's rude and I'll be sure to remember that when buying their wedding present." (Not that I would do anything that malicious).