The sentencing consequences will depend on the specific charges filed against him, and the gradation of those charges. In addition, there are numerous other considerations that can affect the sentence. That being said, a Disorderly Persons graded offense exposes him to up to 6 months in jail, and an indictable graded crime exposes him to a State Prison sentence of 18 months on a 4th degree, and 3-5 years on a third degree. You should seperately consult with an experienced criminal defense lawyer to see what your options are as the victim/complainant. Good luck.
While I do practice law in NJ, this information is offered for informational purposes only. It is not intended as legal advice and you should not rely upon it to decide how to resolve this issue. No Attorney-Client relationship is intended or established by this response. You are faced with a situation where you need to consult with an experienced defense lawyer admitted to practice law in NJ before you make any decisions as to how to resolve this issue.