When your W was in full blown MLC, how often did you notice her swings/changes cycle? Was it actually 2 mos?
Then I would waint four sessons of cycles (making sure she stays consistant) before putting up hope for real change.
Do not allow this woman to use you. She knows you are an easy mark for her attentions, she may "get you back" only to lose intrest after she "has" you.
Good luck- you are a more forgiving person than I could ever be.