Ex-boyfriend harassment

I was in relationship with a guy for almost 9 years. We had an age gap of 8 years. This was a long distance relationship and I was very young (16 years) at the time of commencement of relationship. I ended the relationship a couple of months ago due to insufferable mental and verbal abuse over the years. I have been so traumatized that I am seeking psychological help. I have tried everything in my power to say no in a very firm manner. in fact I have blocked him from everywhere. He has threatened my with suicide,A killing me, killing any potential partner If I may have. He has the contact details of my relatives. he randomly texts them to just get my attention which at the moment I am not providing. He threatens me to call my relative and to tell them everything just to ruin my name. He says he do all this in the name of love, which quite frankly is not true. I am very distressed as I have a family to lead on with one sick mother and two sisters, my dad is no more. I want to file a complain to restrict and restrain him but I don't know how to proceed or will anyone listen to it