IME, the public gets off on teacher-related scandal. They want teachers to be spot-free, uber-moral people because "WHAT ABOUT THE CHILDREN?!" That someone picked up this story for some pearl-clutching alone is enough to set off the BS-ometer in the administration -- and if your ex doesn't pass the smell test and there's reason enough to believe that he's going after you (heh, there is), there's a good chance a LOT of folks in your district have your back.
WTBH, if you're interested, I can pass along some links that might be helpful. It was really helpful for me to have the language to think about my XNPD's behavior and how to deal with him when I *had* to interact with him for DS12's sake.