My ex and I broke up 6 months ago. He has been harassing me for the return of a security deposit (that the landlord still has) for the past 6 months. I am still living in the apartment, so the landlord still has the deposit at this time. I have been ignoring all of his communication, but lately he has gotten extremely threatening and vicious in his texts and emails. I've told him to "stop contacting me", but he continues. Should I get an anti-harassment/restraining order against him?