One of my girl is relation to me now she is blackmailing me to marry her

Hi respected sir / Madam here I am facing trouble because of one of my family member problem is initial last one year back she shown interested me that she like me let discuss marriage about this thing to parents also I said to my parents that I like her and shall I marriage that girl my mother is suffering from cancer multiple mylomiya bone cancer she is in final stage so she believes that not the marry relative girl gene situation so she said that don’t want do that tell that don’t want you leave her and after that conversation I spoke within one week that my mother is not interested marrying in relation due to gene problem she cried and we moved on after lot of the she tempt me in many where in chat but I didn’t tell that I am going to marry her or loving her after 10months after we had gone out in car drive suddenly we booked oyo and get to oyo but what’s the thing she initiate to do me some more sexual but due to safety I didn’t do anything but I didn’t insert my personal part in her so after that day she call me after 3days she started saying that she got some bleed she started me to involve me in trouble she is pregnant and she itself said that me and that girl gone outside and period date has been delayed due to our intercourse but I promise here I didn’t do any inter course there but she said to me that I am not going to marry you and here to help you I am pregnant don’t want this child you don’t worry I have that audio proof but in that call I ask her about periods happen she said not happened and I planned to okay come outside I need to check pregnant test she did not come outside then finally I said to my parents about this issue on that day itself then we start meeting their 1st time her mother saying that girl already said that my mother is not accepting love due to health problem but she said that I am loving her but I didn’t love her they with out my permission they see jadagam for marriage and all and they also said don’t want to marriage if they marriage the won’t happy this was said by girls mother at that time girls mother said that periods got delayed we ask them to come to hospital we can check but they didn’t come after that incident her father came to fight with us that forcing me marry her but me and my mother and father was not interested to marry her because I promise here I didn’t love her and I didn’t do any promise I am going to marry her but after that hotel stay girl said to her parent that i am said that if we do like this we can marry now after that girl parents said that okay don’t want marriage this was happened on last July 30th we have a father call proof that don’t want di any marriage let leave this problem now that girl and mother coming to my house and troubling me to marry her forcing me that I was in love with her now her life become hell but still now I don’t know what to do but we don’t take any photos selfie we have meet only one time that was that day which we gone outside now she black mailiing me