Take all of your focus off of her and focus on changing the way you interact with her.
Focus your energy on doing things YOU want (or need) to do. GAL, personal growth etc.
1) Stop sharing any and all personal info with her, especially how you feel. Be mysterious. Every time you open your mouth, you loss. This is a high stakes poker game. Do not show any emotions. Be stoic and content at all times. STFU and let her miss you. Until she misses you, you have no chance of turning this around.
2) Women test men. When we arrive here, we have failed so many tests. Learn how to pass these test ASAP.
3) Get up to speed on seduction and attraction ASAP : Commanding respect, Social Proof etc.
4) Looks maxing, Hitting the Gym, dress more stylish etc.
Those are some of the low hanging fruit. Get a list going, prioritize it. Expand and clarify all the details.
"What is best for my kids is best for me" Amor Fati Link to quotes: https://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2879712