Blackmailing.. plz help..?

me n my frnd met in college 2 yrs ago.. nw she is very close to me.. recently i heard abt her relationship wid a guy wch strtd 4 yrs back.. she is jst like a kid.. she din evn knw wht relationshp is.. yrs later wen she attained maturity, she strtd knwing d thngs, n she doesnt wntd to live in dat relation...she says dat d relationship is not pure.. she lykd him 1ce jst as a frnd, bt dat tym she din knw wht relationship is... she din evn luvd him.. n frm past 3 yrs, wen she says she dnt wana b in relationshp, dat guy strts blackmailing... frm 3 yrs she is crying lyk hell. evn she thot of a suicide... each n evry limit of blackmailing was crossd, n she was forced to stay wid him, as a forced relationship... bt stil she kepy saying 'i dnt wana b in relationshp' n wenevr she says sch thngs, blackmailing starts... i dnt evn hv powers, otherwise der wud hv been a huge war... wht shud i do to stp dis...??? she fyls grt wen she is wid me or toking iwid me...she is my closest swt lil kid... i cnt c her lyk dis..