Controlling toxic Gf blackmailing to do marriage else file Rape case

I met my gf from fb. Few days later her dad died and she cried on the phone asking me to confirm that I will forever stay by her side otherwise she will burn herself with her dad 's cremation. I had to promise her to marry. Meanwhile I found that she is extremely possessive, controlling, doubtful, manipulative and blackmailing to commit suicide, self-harm, break her phone & teared up to meet her demands.(not monetary). I had to prove everything to her via recorded calls, conference calls, office meetings & purpose, chat history, deactivate fb, inform every whereabouts. This took a toll on my mental health. She asked me for sex in friends house or Oyo or her house but I refused as I wasnt feeling compatible with her and knew about her blackmailing instincts. The mistake happened on my birthday when we had sex in car and later she said she she is pregnant and did abortion on 25th day and vomiting 1 week later. Now she is asking to do registry marry else she will file case against me.