PMA might also be low because I see nothing changing in the relationship.
MrsD,
I know this is painful for you, but there IS no "relationship," other than as ex-husband/ex-wife. There may or may not be one in the FUTURE, but until you get to a place in your own head and heart where you stop viewing this as "the relationship," I think you are going to be forever stuck.
I'm NOT trying to be mean here . . . I'm seriously trying to show you compassion and (along with Brian and some others) get you to a place where you need to be in order to HEAL and work on YOU. Only then will you be in a healthier place for your next relationship . . . whether that's with your ex-husband or with someone else.
That's not to say you give up HOPE; you do, however, have to deal with the brutal reality of your current situation (look up that "Stockdale Paradox" thing again that I suggested to you earlier).