I feel like I'm missing some parts of the story, even after reading your whole thread, hon, so forgive me if I'm off the mark.
Drama....hmmm. I think at our age, we are going to have it, whether we want it there or not. But the decision we have, is how we look at and respond to it.
What happened on Sunday? Is hairstylist still trying to sort out old feelings for xbf? Cause, she very well might still have some. We learn that through DB stuff, too. But feelings are stupid and take a long time to catch up with our heads. So, look at her actions, too. Look at her words, and her decisions. She might just be waiting for her heart to catch up. And I think that once you love someone, really and truly, that doesn't even just dry up completely and fly away (although denial helps those who wish it would). Once you've given a piece of your heart away, that's it, its gone, belongs to the other. But the amazing thing is, that your heart grows again - there is always room.
Don't know if I'm making any sense with this...
But I do agree with you, that it is a cycle. You wouldn't know the days when you had high PMA if it weren't for the days you didn't. I lived my marriage that way, I think - didn't realize how content and happy I was until that was gone. So its ok to have to downturn; keeps things in perspective.
I've had one, myself...now the test is to see if we can get ourselves back out of it.