If someone cut contact with male person in toxcis relationship then male person black mailing to female how to do on that case kindly help me out

Hello sir/mam I am in trouble and anxiety bcz of the problem. Problem is, last year I met a girl in Instagram, we have chatted and got closed, sometimes I help her with money as she was telling she is preparing for government job and need some money for personal reasons. Once she needed mobile phone I ordered online for her to given address. The UPI that I used to send money does not belongs to her when I was asking she was telling she is her junior studying in same coaching centre. Later after 2-3 months our conversation went sexual and 2-3 times we had sexual conversation. But in every 3-4 days she was demanding money. And I send her frequently. When later I realised she is talking to me only for money then I tried to avoid her. Now the Junior whom I used to send money was calling me and telling me that the girl always saying you are family member and sending money. That's why I called you. She has taken some money and she supposed to return me in 2-3 days but not picking my call pls give me 2k it's urgent. When I denied he told I will give you back once she will return so I gave him 2k. Later again he called me that he called her father and his father is asking your contact number then only her father will return money. And ask me if I can give him 2k more he will not share my number to her father, so I given him again 2k. Now a man blackmailing me with girl's contact number saying he is her brother. She used to talk to me what is my relationship with her ? How do I know her? Bcz she has run away with someone and missing since 3-4 days and she left her phone in home. Again after 2 days He msged me that he is her brother's friend and he has this phone, if I pay some money he will destroy everything like all the chat that he recovered by the help of a data recovery guy. What should I do? I think it's a scam or will there be any legal issues in future?