i don't want to allege that you're not getting along with her, but this is one time that you should play nicer with her than you EVER did, even during courtship! very hard, but DO IT...
make sure it's amicable and never never never argue or threaten her, don't get jealous, don't interfer in her life whatsoever. the worst case scenario could be a domestic violence allegation and mandatory intimate relations restraining order. if granted, you could and will foreever lose any and all gun rights due to the federal laws, and it carries a minimum mandatory 5 year sentence.
play VERY nice with your ex from here on out.