Related to ex boyfriend's torture and abusive behaviour.

I had been in a relationship for 8 years but we broke up for 1.5 years. In starting his behavior was quite good but as time passed after about 5 years his behavior became worse to worst. He uses abusive language with me and even my hostel friends and colleagues. He has been blackmailing me for my pics. He calls to my home,hostel friends and in office too and tells them about me that I am characterless and many more bullshits. I am not able to face my colleagues and friends because of his abusive behavior and sometimes I got deep stress and not able to focus on my work. His financial condition is not that much good so he asks for money from me and even after getting money his demands does not end then he again asks for more money. I am fed up of him now and wants a permanent solution of this person so that I can move forward in my life and focus on my future. I tried to stop him and gave him many warnings but he is not ready to understand. So please suggest me what actions can I take without including my family in this whole matter.