First off I agree that having Accuray in your corner is a big time bonus. I have learned more from his postings then from books that I read about relationships.
Second, most likely she probably didn't wish you a happy birthday because she didn't want to give you any false hope.
Right now you can't make things better but you can certainly make them worse especially if you apply pressure.
Jan 2017 my W told me she wanted out that she felt trapped like a caged animal. She filed March 2017 and around April 2017 I accepted I was going get divorced. I completely went they other way and have done nothing to stop it. We are divorced she is still living with me and we have sex from time to time. She has her own house and is in zero hurry to move out. I am going to ask her to leave if she is not out by the end of the month and I am starting to feel like a caged animal lol!
Once you decide that you are done with this BS and you deserve to be with someone who loves and cherishes you everything will change it just takes time.
Be a great dad eat right, exercise, get good sleep, read, learn, GAL and everything will take care of itself.