He is so angry with me!!?!

I was in a 4 year relationship with my ex boyfriend. We broke up in August as he is in a dangerous gang, i couldn't take it anymore. We have some of the same friends and whenever we some of my friends go for a night out and he's there with friends i try keep my distance from him and leave but he follows me out to 'talk'. although i still love for him i know i did the right thing. Anyway whenever im dancing he never takes his eyes off me, and gets pissed at me and calls me names. He gets into my face alot, he grabs my arm if i walk away. My friends are under the impression he is pissed off because am trying to move on. They also think part of the reason he is angry is because he screwed up badly and he doesn't want anyone else to have me. would that be true.?.I feel intimidated by him. He keeps telling me he wants me back.he wont back off me.
Please give me some advice if you can, thank you so much


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