Tad, if I may,
Acceptance is not only to accept their departure and move on but also accept your life as it is. You create your own life. Unfortunately, your x-wife doesn' t want to be part of it in the same way you do right now..
What needs to change in order for you to feel good ?? Because I garanty that if she was to come crying at your door tonight, you would be VERY reluctant in taking her in. So, it is not in relation to her !! What is it? When you find the answer, you will have reach acceptance in all it' s form and shape.