Ha ha, I would feel the same. Not quite the same thing, but my best friend got married 10 years ago, and we had been discussing 'first dance' songs. I was due to get married the following year, and told her what we would be having.
Guess what she did her first dance to? You can actually see me crying on the wedding video watching them, ha ha, everyone thought it was tears of joy!
Incidentally, she is now divorced, and I didn't marry my then-fiance. We are both married now to different blokes.
I was furious though.