I did see it somewhere though not sure where. I thought it was on the site but it might have been in the letter sent with the wristlets or during the cutscenes. You can do it again Im pretty sure but you have to get the current wedding annulled, you cant be bonded to more than one person at a time.

I also think Yoshi said in a live letter in the past that getting divorced is as simple as dropping the rings, but that may have changed.