If you feel threatened by your neighbor's husband post an incident involving a domestic abuse situation with him and her and he is now contacting you, I suggest that you contact law enforcement about the situation and make a police report. You are a witness to the incident that you have written about between the husband and the wife, and the unwanted contact he is seeking with you could be deemed improper with respect to the criminal charges against him that are pending.You might also consider consulting with a family law attorney to file a petition for a restraining order against the husband if you are that threatened by him.