I too have found myself spiraling down during enjoyable moments. Even at the zoo yesterday as a family I'd find myself glancing over at W, then the questions/thoughts start running through my head.
I would like to eventually receive some type of remorse or admittance from W that what she did was wrong, but I know that may never come because (as I mentioned earlier) she doesn't think she did anything wrong- we were S, not living together, she saw no future for us...
Interested to hear from others as well- the more perspectives the better!