Please help me to save the life of my best friend

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i'll tell u the wwhole story now there is a friend of mine,who is very aggressive and very caring. she had a bf,actually i came to knw this yesterday only tht they both broke up months ago. she used to stay out at nights and when i used to enqquire,she used to tell me tht i was out with my bf,and so i didn't had anythig more to speak. and whenever she used to return back in the morning,she always have an injury,either on her face or at any other part.And when i asked wht happened,she used to lie tht he and her bf went extremely crazy while having se*. her age is 21 and her bf's age is 23 ok enough....let me show you the dark side of the moon yesterday her bf called me up and told mee te whole deal.My friend is a se* addict now.She's been sleeping with a guy whos of the age of his father,probably more. She sleeps with her three to four times a week.And tht guy beats her up a lot and am scared tht he has made her proene to drugs. i am scared talking to her abt all this coz if she'll come to kknw tht i knw everything,she'll probably kill herself or me. and the worst part is tht though she's aware of the fact tht whatever she's doing is wrong and a deadly act,she just can't stop herself. they go to a farm house everynight and when she returns i can see wht tht guy might have done to her by her wounds. she is my best friend and i soemhow wanna get her out of this i can;t tell her parents all this,as they are diabetic and her dad is a heart patient,so i am scared abt tthem also. am completely perplexed and baffeled i dnt knw wht should i do to get her out of this,as i feel tht she has got a addiction of this and she just can'r stop herslef. pls help me to get her out of this. i'll be really thankful to you all