Legal Question in Landlord & Tenant Law in New Jersey

Strictly speaking, any unwanted guest is a trespasser and you should be able to ask the police to remove him or her. However, New Jersey tenancy law is very protective of tenants and many police departments will not remove a guest who once had permision to stay unless there is a court order or a court officer involved. Additionally, some breakups look more like familial disputes than tenancy problems. So, I recommend that you ask the question again in the family law forum and use the answer you get together with this one to determine whether you are better off in landlord/tenant court or somewhere else.

See also: http://info.corbettlaw.net/lawguru.htm