Updating on this:

He went and yelled at my dad in public that I am a slut and he has my exes numbers, etc.

Then he came to my work-place and expected to have a civil conversation. Finally when I walked off without responding, he questioned me if that's the way to tackle the end of a relationship and sent me a mail asking for his stuff back. I don't know what to do. He is just a plain whacked up psycho who terrifies me every second. I did inform a senior in my office and she agreed to keep an eye out for me.

We just don't want to make him lose his job and provoke his anger.