Women is blackmailing and tourchering me

I had a girl friend before my marriage at that time time she was divorced and having a 2kids and after 4 years again she came into my life and totally she was in problem and solved all her financial problems and since from Iam looking over her family. By mutual understanding we where in relationship and before she was also telling that helped me lot and saved all my family members life and we are surviving today means by you only. And asked me to givee one life for me and my children's. I agreed and told OK. After solving all her financial problems and made her total free from burdens. Since from last 2 months she started blackmailing and tourchering me and telling to make a new home worth of rs 25lakhs if not I'll come to your home and make the hell and demolish all your family members and give a complaint in police station and spoil your life or I'll make a suside notice and die, for that her mother also supporting her lot and warning me daily. Today morning big quarrel happend and warned me that by Wednesday she need a new home if not I'll informe to my husband (already divorsed) and my brothers and make an big issue. What will happen you see like that she and her mother warning me. I had told that Iam ready to give you a good life and already giving her a nice life but she is not listining and going in wrong way. If she make an issue means in my home my parents and my wife will die and my life also get spoils. Iam not knowing what to do and how to Handel this. I need a permanent solution. Nowadays iam knowing that she doesn't need a life she is going behind the money and blackmailing me. Already I had given her more than 7lakhs and now she started blackmailing me by seeing my family weakness. Now she is telling that she don't want me anymore just make a home and go away from my life. Kindly help me by this situation. By softhearted and concern on her I had done all for her but she is taking this as disadvantage and blackmailing me. She is using bad words and hitting me by equipments. If I try to tell anything by huge voice start quarling and making a issue. I need a help and come out from this critical situation, by blackmailing she is ordering me to give money daily and Daily Iam giving 2000/- for expenses. For proof purpose she is telling to come daily let the area people know that you are coming hear. All by pre-planning she is attacking me and daily Iam getting torchur and mentally upset. By her tourcher and blackmailing I had done already 3 lakh loan and given her my personal amount of 7lakh Rupess. Now Iam helpless. Help me please and get me out from this problem.