While having linner (late lunch/early dinner) with my Neighborhood Gal Pal, she's to me, "I have something to tell you... I'm moving."

Good for her!
She gave her notice at her job yesterday, she'll now be retired and their going to move closer to her daughter in Oregon.

I've know all along that she was never happy here in Cowboyville Arizona, having moved from Maine.
I'm just over the moon excited for her!! AND I called dibs on being the first guest.
But here's the rub of all of this: about a year ago or so, Mrs. Next Door Neighbor broke up with Gal Pal!!!
I feel like I'm stuck in the middle, still being friends with both of them. I've not spoke about one or the other either of them since this happened and told them both that's how it was going to be for me.
NOW, do I say anything to Mrs. NDN or not?
I asked my Gal Pal and she didn't care one way or the other, she said, "Mrs. NDN won't give a hoot anyways."
DH says that I should say something to Mrs. NDN, otherwise it may create a riff between me and Mrs. NDN. If she finds out what's going on and asks me if I knew about it, what would I say?
SO, it just so happens that I'm going to Bingo Night with Mrs. NDN on this coming Tuesday, I'll tell her then, but I'm not going to get into any details, `cuz I know loads of stuff that I don't feel she needs to be aware of.