Eleni *hugs*
I have had to deal with similar three times in this game and ended up doing the following
I sort of did a reset of my character, using in game fudgery. This allowed both characters to continue (I hope) with minimal dependency.
They wandered off into the sunset, and at some point he (my char) may came back.
The partner lost their fight with the darkside and disappeared.
Now, if the other player's character is not going to be around you can do things involving them, which makes it easy enough. You can accept the marriage and find a suitable way forwards, or come up with some plot that means there was no marriage. If you want help with that ooc and ic let me know I can think of a few ways we could make this work.
If the other character is still being played, it becomes difficult. If you can both agree on the way forwards great, if you are no longer talking then I would suggest just dealing with your character and what you control, that should help minimise any god-modding over the other player. Also try to not care what the other does, that way lies madness. You will suffer issues with characters who knew both, just be true to your character and the memories.
Poke me in game and I'd be happy to help.