I know it is hard horsecab...it always is to let go of those we Love...
But,,as you shared,,you must respect her wishes regarding her personal life and marrage. If she wishes to work on/through it,,then it is "just" that you allow her...
Often,,the best way to move forward in feelings, is to move forward in action. Do something different in your real life,,even if you must force yourself..Join a club,,take a class,,,volunteer...but do somthing new and different. It will help,,,that I can promise you.
With Care,
Lenny