I am being threatened by a woman about child custody.

She is a Brazilian, i am being an Indian. We started from online dating and it was too late for me to get to know that she is a nymphomaniac. She is a dangerous person by her mentality. Initially it was my fault to have dated her. I being an immature guy, made some false promises to her that even if my family doesn't accept her, we will find a way out to stay together. I called her to visit India to meet my family in person and let them assess her if she is fit for marrying me. Even though i knew that this is near to impossible. Keeping that aside, one month earlier when her ticket was confirmed, i told my parents and they got angry with me, i faced strong opposition from them because i did all this without their consent. I told her to cancel and she bounced back at me saying that "You don't want that i visit you". Then i told her that "Okay then, come and visit but keep this thing in mind that my parents are not ready to receive any guest". She started to threaten me from that day onward that "I will pass on your address to the police and tell them that i came at your responsibility, if anything happens to me, it will be your fault". I had no choice but to let her come and convince my parents. I was in shock from that day and i realized that things started to turn bad for me. She came here, first two days were fine, setting up room in her hotel and food and rest. Third day onward, she started to behave like a queen, like totally putting blame on me as if it was totally my responsibility. For whatever reason she didn't like India, she put the blame on me and started fighting with me even on the middle of the road, in taxis. Being a nymphomaniac, she wanted to have sex with me at any cost, provoking me by touching my parts every time. She got very uncomfortable when she didn't get what she wanted as of course Indian culture permits nothing like this. She started to threaten me again at midnight saying that i will leave this hotel and tour India alone. Then somehow i convinced her at her room and she started provoking me for sex a lot. I fell into emotions and did have unprotected sex with her but it was for 5-10 seconds. I didn't even ejaculate in her, she was on her period. I pulled out an ran towards my home in fear realizing what have i done. I told her to shut up and take medications, she got what she wanted from me and made a fake promise that i will take medications. Then somehow she went back to Brazil facing rejection from my family, i decided to terminate things with her slowly, i had a bad fight with her when she got back home. I blocked her for a few months. Now she came back again with a life threat for me. Saying that i am pregnant with your boy. Now i have to take custody of this child, support him financially for the rest of my life. She is forcibly putting responsibilities on my head and she told me that she will make my life hell. I am in panic, i am jobless and i don't wanna tell my family. What can i do now?