This is temporary. The feeling of longing for her will go away. It may take a really long time. But it will.
I don't think it's particularly dark to hope her marriage fails. In a purely objective, non-negative way, I think it's realistic to know that it will. You saw what she did with you and it WILL happen with the next person. Realistic long term relationships don't start with a marriage after 7 weeks. That's a fact.
Her moving can only be a good thing. The anxiety will pass. Sit with it for now. Experience it. Feel it. Understand it. See if you can get to the bottom of what it is. It's a long process but I guarantee it's not totally related to her - your own wounds from before you even met her are opening up. There is more to it. If you seek it and find it, you can understand it and heal from it, eventually thriving.
Very wise words, I thank you for them. You are correct, it's not so much her but the wounds that keep being ripped open in relation to her. Once I was able to calm myself down enough to think through things rationally I realize it's not her leaving that is the problem. Life will be better knowing she is not in this town. It did, however trigger deep fears of abandonment that date back to childhood. Like so many things with her, it goes back to my messed up childhood and BPD mother.
Thank you again.