Tortured

Hello sir/mam i was in a relationship with a guy around 5 years ago. and we broke up after around 1 year. and frim the day we dont talk from the past 3 years . And as now i am now getting married to some other guy from the past many months he is sending me many mails that he would not allow my marriage to happen or he would do each and everything possible to make it not happen and even he says that he will kill my boyfriend . After one or the other day i get a new mail from him torturing me that he will show the pictures of us when i was in relationship to the people around us and make me feel guilty. He is continously blackmailing me for taking to him but i dont want that. And to be very true i am bot able to take any action as we people know that he is the worst person . He is a type of goonda and each and every person near to my place also says the same that he us too bad that he can do anything . I dont knw what should i do as day by day he is getting harsh for me to handle that perso.