what legal steps can I take against an individual who is harassing me after I asked him to leave me …

what legal steps can I take against an individual who is harassing me after I asked him to leave me alone? I already blocked his number and blocked him on social media.he is inviting my friends to get to me. he is violent and verbal abuse happened. he is using his friend’s car and social media account, if I block them they just use another friend’s account. he drives by my apartment 2-3 times a day. we were friends but I ended it after he wanted to be more, he knows I have a boyfriend. he physically stopped me when I tried to get away from him. 

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