Legal Question in Criminal Law in North Carolina

Not really. I suppose if you are the one he is messaging and you have told him not to then you could go cry like a 6 year old to the magistrate about being harassed. As to the pics - hey, if you didn't want them on the internet, you should have thought twice before taking them. If I were you I'd be more concerned about how the soon to be ex would get his hands on your girls phone and if that's all he's getting his hands on.

Threatening to expose pictures of you is clearly blackmail, and it completely inappropriate. The problem is that you will probably not get a prosecutor or police to charge him. Plus the pictures then become part of the evidence in the case, and become public record. While what he is doing is not right or legal, you may want to let sleeping dogs lie.