Hey everyone,
At first, its kinda weird, that you aren't getting any messages or informations about the fact that your partner returned their ring and divorced. It happened to me and i was totally confused when she told me we actually aren't married anymore.
Another thing would be, that its kinda creepy, that even after you returned your ring and got divorcd, the ex-partner can still keep the ring and USE it. I even married again in game and my ex partner is still able to teleport to me with the old ring. To me it doesn't feel like a real divorce, since my ex-partner can still use the advantages of our wedding, but only my new partner should be able to do it. Feels like im multi-married.
I also would like to suggest that you can have some kind of a "Eternal Bond" menu. On this menu you could see who you are married to, when you got married and how many days you are married in total. It also could be the place where you could see if your partner divorced.

Have a nice day