Nobody is telling you NOT to focus on the positives. What we are saying is to stop burying your head in the sand with all the negatives.
All your W's "positives" are for her and her only. All your "positives" are for your W and your W only. See the problem here?
Nobody is telling you not to pray, believe or stand. We are suggesting you start living in reality. In order to live in reality you need to set boundaries and create plans and goals based on reality, not prayer. Prayer will help you through the process of setting and obtaining goals.
How are you going to feel if/when your W files for divorce and you look back and realize you may have had to chance to turn it around but you didn't due to your lack of accepting reality? And hey, reality can change but only if *we* change it.
Put all your mercy in God but stop putting yourself at the mercy of your W.