Breakup advice

I have been in long distance relationship with a guy from last year (February) . First we used to stay as a normal couple but with changing time everything changed . we used to fight a lot due to his misbehaviour and possessiveness He always try to control me and I asked him to break up a tons of time But everytime he kept on insisting he'll not do this again and his friends also used to convince me but Whenever I said No , I'm not gonna stay ,he used to cuss me and blackmail me that If I try to leave him he will commit suicide . Because of this I thought he will change asap I should stay with him coz I love him . He lives alone he doesn't have parents And always he gives me this reason to melt that I didn't have anyone without you , I can't live without you etc But till now he didn't change he is as usual Now I have decided to make ways apart I told him calmly that I didn't want to stay with you I am done with this but he doesn't understand me he is forcing me to stay with him or else he'll commit suicide I stopped him as it is wrong but he didn't listen to me so I said you can go ahead do whatever you want to he stated that he'll commit with a suicide note stating that I'll be responsible for his death. I don't know what to do ! Am I wrong !? I just want to end this relationship And make him stop forcing me !