How long 'till you feel better? Hmmm... .When can you start working on yourself? The sooner you focus on what you and your kids need and compare that to what you don't need, you can make a start.
I know it's unhealthy for me and for my children to have her in our lives. The problem is, although there were terrible low points, I can't seem to get over the highs we experienced, and how loved I felt by her when she was in a good place. More loved than I've ever felt by anyone. I miss this terribly and can't seem to move forward.
And this is a big problem for many of us and it was certainly my problem! too. It might be worth considering that she got you to these low points just as she got you to those high points. This was all her doing and from my experience I doubt a pwBPD can give you one without the other. I'm suggesting here that getting you to those high points was by design, a calculated plot and not because of the person she is.
As for plastering everything over her FB page declaring her love for you, I would think it means absolutely nothing. Her friends have seen that before. And every single one of those FB posts has a "delete" button. My ex did the same thing but now her FB profile pic is a photo of her kissing my replacement and she is no doubt declaring him her greatest love ever as she did me.
Facebook declarations to her friends cost nothing and is a way to build your euphoria with just a couple of keystrokes. pwBPD don't have the same sense that nons do of what it means and how it appears to go from one relationship to another always declaring the new love the greatest ever. Declaring these things on FB doesn't have the same meaning as it would have if you declared it.