Blackmailing

Im 29 years old, I met a 24 years girl before 5 years back on a shop, she took my mobile number as shopkeeper,then she start texting everyday & we fall in love, we did lunch many times in hotel, share pics of families even we shaired some privacy pics, we did kisses hugs, but we didn't do intercource. after few a years breakup because she was forcing me to get marriage with her, I told her that I can't becoz my parents are very stick in this case. After this she gave my number to an other boys, I received some calls from guys in which were trying to involve in this case and black mailing if I will not contact with this girl we will do this bla bla bla. Then she informed to my younger brother about this and try to black mailing through Facebook, I called her and said remove my pics from facebook otherwise I will also do this, she deleted,she said give my pics back, I said already deleted. Now she is continously getting information about me from different sources and text me the details to show that she can do everything. She just wants to get marriage but I will not. Please help me what should I do?