Ex Girlfriend and her family threatening me of filing false case

I met a girl, she used to be my childhood classmate. We liked each other and decided to marry and introduced each other's family over video calls. We live in Hyderabad for jobs. So we met, she came to my room and on many occasions we got intimate. But slowly I got to know she gets abusive when she gets angry and while in a relationship only she accused me of using her for intimacy and taking her to my rented room. She used to live in a pg. I felt humiliated and lost interest to continue with her because of her aggressive and abusive behaviour. I informed her n her family that I dont want to move ahead with her. Then i stopped taking her to my room, but she insisted on coming to my room. Now the thing is even after informing that i want to discontinue the relationship she insists ne of having sex which i deny, she insigates me over phone and whatsapp with sexually arousing messages still now. I refuse to entertain her intenstion she gets aggressive and then starts abusing me over whatsapp. Now she is been diagnosed with depression and some mental health issue, according to her uncle and he wants to know. She had a brain stroke and depression and they are accusing me because of her condition. I have enough proofs that she was also interested in physical relationship with me in Hyderabad. And she still instigates me to be intimate with her over text. Its been 2.5 months we were away from each other and not met physically. But over whatsapp every week she tries to instigate me to please her sexually through call video call. We dated just for 2 weeks or so. She once took me to hotel in Hyderabad where she entered the details by herself and made the payment to for spending night with me. I do not want to file any case against her because she is a girl and mentally unstable because of brain stroke and depression. I want to settle things amicably, but she is forcing me harrassing me mentally to be with her as she had sex with me. But i have proofs that I never forcefully took her to my room and twice she came to my room without informing me. I am keeping myself mentally strong but her harrassment is getting over the top now. Please help and guide how to deal with her and her family. She is in the weird opinion that people only get married because they need sex and as she had sex she is married to me. She justifies her acts of abuses, blackmail and threats that she has not left me after sex.