Legal Question in Family Law in North Carolina

What you have described is likely not blackmail. The wife merely made you an offer to not sue or take other legal action(s) against you in exchange for you staying away from her husband. Blackmail is when you demand money or other property from someone in exchange for not revealing some sort of information about that person. Further, even if what she did were to be considered blackmail, in NC blackmail is a crime, not something you sue civilly for. So the short answer is no, you likely can not counter-sue for blackmail. However, you may have other options. It is likely best to take a wait and see attitude. If you are served with a law suit you will have plenty of time to consult with an attorney and come up with a game plan - no real need to let this worry you too much now. Best of luck.