I can somewhat relate to how you're feeling. It's like, if they're not involved anymore, then why are they still FB friends? Why is he liking things she's posting to her wall? It's stuff like this that drives me crazy about FB.
And then...when you step back and look at it in the grand scheme of things, what is one "Like" on a social media site? It's hard in these types of situations to not let someone else rent space in your head for free.
Keep up what you've been doing. It's obviously producing some results, both in how you feel about yourself and it seems to be resonating with her.
M:35 W:31 S: 9 D: 5 M: 11.5 yrs BD: 5/13 W moved out: 7/13