Just a quick thought/question in response to your very good point on PMA:
In relationship, there is a sort of balance that both parties work to regulate. I question whether, by maintaining a positive outlook on the relationship, we are unknowingly causing/allowing/ispiring the our spouse to think and consequently believe the polar opposite. The important thing to remember is to keep our whole lives in our focus - maintaining a positive outlook on it, rather than a myopic view of our relationship and the significance it has. Once we allow it to eclipse the importance of our entire lives, our PMA with regard to the R has little value in the totality of our lives. It puts us on a quest to save our lives by saving our relationship. Let go, focus on the other details that make up the big picture. The stranglhold you have on your relationship will not help you save it - no matter how it is you are trying to control it. However, once you are living towards making the totality of your life something wonderful, it and you will be very attractive to another - quite likely your current spouse.
“No problem can be solved from the same level of consciousness that created it. ” – Albert Einstein