Don't remember if I made this update, but the move back to the Big City is official. Found a short-term sublet, bought my flight. I've my friends. I'm filling up my calendar with a lot of hobbies and feel really good about it.
It'll be a bit strange to see people from work again. Everyone knew about my long-distance marriage and plans to move to Country B. They all said really nice good-byes and wished me well just a few months ago. Not sure how I will handle questions about my return. I guess a simple "I'm separated" will do?