IMHO indecision is the root of our spouses emotions. On good days they kick themselves because they are not quite committed to the M. On the bad days they are kicking themselves because they "think" it can't get better. Those are the days they blame us of everthing under the sun whether its our fault or not (this is how they justify the way they are feeling and/or their actions) so goes the rollercoaster.
We have our own rollercoaster, on the average days we are looking for the other shoe to drop (sometimes being insecure), on the bad days we are propping our selves up and wondering if its all worth it, and on the really good days we know it is
The act as if ploy really helps to smooth out the ride for both parties. Helps your PMA which calms them down and the less we poke into their funky emotions when they are having them the better. (believe me, major backsliding can occur, and has )
When the good days far out number the bad, that is when they will start to commit. They won't admitt it yet, but you'll see the difference.