She gave you up as best buddy when she moved out and filed for D. So I agree, you don't want to be baking any cakes for her.
Having said that, you want to make sure you're not coming off as if you're punishing her. Her comment "I understand that you're not talking to me right now" makes me wonder if she thinks you are. You're not "Not talking to her" you're standing up for your principles, living your own life, and giving her the space and new life she is seeking.
She might not like it that you refuse to be best friends, and "be there" for her through and after the D, but she'll respect you for being confident, strong, and principled. I also would make sure to show her love during your interactions. Then focus on your new life. She may eventually surprise you and decide to follow.
Tell us about your GAL's. What new and exciting things you got going on?
M: A really long time. Crisis: 5 years. She's still worth it.
Life is never made unbearable by circumstances, but only by lack of meaning and purpose. -Viktor Frankl