It appears as though you are interested in seeking relief through the North Carolina "heart balm" torts. From your facts, an action for alienation of affection or criminal conversation is not likely to be successful. Please consult an attorney to more more details for further evaluation of your claim.
However, if your husband feels as though he is being harassed by this person, your husband, not you, should inquire into relief through the criminal justice system. Two statutes may be relevant to your husband's situation. First, Harassing Phone Calls, NCGS § 14â€‘196, which probhibts a person from repeatedly calling with the intent to abuse, annoy, threaten, harass or embarrass. Second, the Cyberstalking Statute 14-196.3. prohibits electronic communication such as text messages and emails that are threatening or repetitious for the purpose of harassment, etc. Unfortunately, from your facts since it appears this woman is not contacting you, you are not the proper person to seek relief. Therefore, it is up to your husband to do something about it. If your husband is honestly seeking to stop all contact with this woman, there are remedies available.