This GUY keeps texting me/emailing me that I'm a freak, drug addict and S)lut!?

This guy that I told kindly, I didn't want to see any longer...has been cyber haring me for the last two days. I've already blocked him out my facebook and changed my number an hour ago---he called me a s_(lut, freak drug addict, because I didn't want to see him anymore. He's 40 and Im 26. We know mutual friends and now I know he's going to slander my reputation because I dumped him...even though we were NEVER a couple...