Harassment by my boyfriend

I am a 21 year old student, i have been in a relationship with a guy for past 10 months, at first everything was good, later i found him cheating on me repeatedly and somehow i gave him chances because both if us loved each other a lot. Eventually fights began and so did his aggression. We share a physical relationship out of consent. For past five months, i have been bearing with all of his abuses over calls and messages. He has a highly unstable mind as he gets angry and then cries like he doesn't know anything, he then threats me that he will eventually kill himself if i leave him (he has also self harmed). Lately he has started abusing me a lot. I did threaten him that i will report to the police if he continues to do so, though i have blocked him on all social media platforms but unfortunately he knows where i live, where and when i go for my classes. I have even sent the screenshots to his parents for them to look after him and in response they show absolutely no concern for their son. Lately he has been threatening me by saying that he'll kill me or won't let me live. I belong to a family with humble background (daughter of a diplomat) and my parents won't be able to take this shock so i can't even involve them. my question is how can i stop him from doing so and also save myself and keep the complaint only to me and avoid involving my parents?