Chris, I am reluctant to say what your Ws motives are since I have only heard your side of the story.
I am short for time but feel I have some helpful points to make in your sitch.
[list] [*]Decide what you want.
[*]Set boundaries. What you will tolerate and what you will not.
[*]Communicate these boundaries to W.
Whatever her reason for coming back, she is back, and it could be a combination of reasons. You may never know and it really doesn't matter. Things will change.
The joint FB thing is controlling behavior. If you pout your way into W agreeing to be controlled again you will ultimately regret it. You have to love in a way that the other feel free. Joint FB is not Detaching, now is it?
M 53 W 54, M since 98 D15, D19 8/2013 discovered EA, W maintained contact with OM until 10/14 7/2/17 W said she wanted S, 7/25/17 moved out of MBR 12/17 W says moving out 5/18, W still in home.