How do I deal with someone who is blackmailing me that I will upload your video and pictures on social media?

I had a relationship with  dance bar girl  from Punjab working in Bangalore. She is a divorcee &has a son. She approached me first & took my number through bar manager. I m 44 yr old married man with 3 kids & wife & I fell  into this relationship. This dance bar girl said she truly loves me & want to be my keep. We started getting physical. I started lying to my wife & started meeting this girl at hotels & we got physical. Initially we were using condom & she made me believe, she did  permanent birth control after her divorce. So I started having s*x w/t condoms. Now she is telling me that she is pregnant. I told her to abort. She's telling that she wants my  kid. else she is demanding 50 lakhs for abortion. She took my photos and videos while I was drunk and dozed off, she is threatening me that she will publish it through social media. I m in big trap. I spent a lot money for her shopping, tickets, iphone, gold. My wife has no idea about this. I m very scared. I've a good profile in society. How can I get out of the situation.