HE WONT GIVE UP!!!?

so my x and i have been dateing on and off for 2 years now, and he dumped me in january, and hes been..."over protective" about my life- and he wont leave me alone...he IMs me howmuch he loves me and how much he wants to do me, but im 13 and hes only 15 and i dont wanna lose it yet and not with him, so i keep telling him to leave me alone and he wont, then we get in these ugly battles against each other and hes said so much that has hurt me and my friends{he talks to my friends online and on the phone} now ive finally moved on and am finnally fixing my life up and even though we used to be really good frinds i dont want him part of it so i told him that but i am still afraid that he might come back to me...in the past he has supposivly beat the **** out of his xs...and now im afriad he will come after me my friends or my new bf....Did i overreact or should i completly shut the door between usfor good?!?!?!!?