I have another take on the "has to.... wants to" thing. We all (the three of us, at least) have been at this for so long, watching them wander around in their own fog for so long that, at least in my case, it's so hard not to look for their "angle" when they do something nice. I agree with Andy on this, that they won't do anything they really don't "want" to, and they've made that pretty clear over the many months past. I catch myself questioning so much of her nice behavior, and wondering if she's setting me up, manipulating me into some corner. Then I remember that she is really a nice person in spite of the recent past. I realize I'm seeing the person I married shining through the alien's mask. I think when we notice them behaving like this, we need to put away our fears and suspicions and just "catch them doing something right".
And, man o man, 16 months? Wow, that would be so hard to hold out that long. I can't possibley be worth the pain to hold on that long, can it... Why, I've only been at this, what, 15 1/2..... oops, never mind. Good for you and your resolve and perserverence. And thank you so much for being my friend and my role model.