I'd suggest to do it in person if you can. Just like any other conversations:

"Hey H, before we went to retrouvaille, you had mentioned that you had planned on living elsewhere. Curious to know if you are still considering it? Just trying to be prepared."

Me:45 ExW:48
M:04/97
3 Bombs & 2 ReCons
1st BD 11/10
D Finalized 4/20
D-16 S-14
Going in one more round when you don't think you can. That's what makes all the difference in life.~Rocky Balboa