This isn't just about validating W feelings. This is about you projecting that you are going to be okay regardless of what happens here (you know that right? If you end up D, you will be okay.). If she asks about what you are doing, don't give specifics, be vague. Don't tell her you want her back and will help her move back in. She already knows that.
Has there been a time during this process that W has ever felt like she may be losing you? A little after the A was discovered, but after that?
And you are going to ask if that just doesn't make it seem like you are ok with the D and accepting it. That's fear, and you can't let it rule you. The point is to move from the pursuer to the pursued.