In 15,000 posts here, I've noticed that there is NOTHING as powerful as these two things:
1) The left-behind spouse suddenly DATING (or giving the appearance of dating, or being willing to date);
2) Legal fear.
WORDS TO THE WISE:
It is best NOT to draw any serious conclusions, nor make any potential life-altering DECISIONS, based on a wayward spouse's demeanor toward you while they are under the duress of either -- or BOTH -- of these two things.
Puppy
Puppy, from what I know about your sitch, wasn't it when you decided to start dating that your W finally turned around, in a significant way?