trouble breaking up Watch
give him so time
did he have that "hold" over you from the start? and is that how you got together? or did you have real feelings for him from the start?
"GET BACK WITH ME OR I WILL KILL MYSELF!!!" yeh sure, emotional blackmail anyone?
anyway he will not leave you alone now since you said you would probably get back with him. You need to tell him that it will never happen, or he will keep trying. If he doesnt stop after that just tell him to f*** off. And if that doesnt work, break off all contact.
tell his mates/parents/your parents so they keep an eye out in case he does anything.
meanwhile give him a hug and say lets just be friends
Try telling him that he is making you unhappy and if he really loved you that much he would let you go so you can be happy and that you want him to be happy too..