For you Tostada, I hope for a similar success. For me, that would be a serious serious moral dilemma.
I'm going to throw out something kind of crazy. At this point, as I think back, my memory of your situation is that your 180s have been with respect to things that were problems in your marriage. Perhaps you need to do a 180 from the current situation.
How about this, for her birthday, bless her by letting her watch the kid so that you can go out with a female friend. I'm not advocating this, I'm just saying that she's mentally moving on, but, she knows that you are still there and still hoping for a change. Maybe if she sees you truly moving on, it will shock her and bring her around.
I've a friend who has been divorced for 2 years and his xW had a new guy very quickly and she continued to be a regular Cruella DeVille. She turned a lot nicer when Brian got his house in order, his job situation in order and was dating an attractive woman 15 years his xW's junior.