Ex boyfriend threats

I had been in a reltionship for 3 months with a boy. We had been sexual. But as he had that constant behaviour to know everything and his questions to knw everytbing abt my past and all the time being stubbon to whom I follow on insta or if someone likes my picture he wias kind of making a trap for me which was making me felt like atrap.I quit this reltionship with him. This was life changer. He quit all his work and came back, from that to this its been an year. I have constant threat, via calls, messages and emails. He just wants me to talk to him until I am not getting married. He tried to had sex with me and when I refused he slapped me. He made a video without my constent is now using it to black mail me by sending it to my friends and family if I dnt tlk to him. He runs multiple fake accounts on facebook and insta even a account on girls name just to be in tocuh with me. He tried to hack my facebook account and has hacked my freiends account as well. Everysay he stalks me wherever I go and threatens to tell evryone about everything. Please help me sir.. I am just sick and want to end this as soon as possible He holds me responsible that I hav multiple boyfriend and this is wt u deserve. Sir I am livinv a life of fear from past one year and now I cant survive with him. He is behaving as if he js right. Which I only know that he is not. Please tell me what should I do. I just fear the dis respect it willl bpight to my family. As I am afraid if they heard about video what they will dp with me.