Getting threats from girlfriend and also asking me to separate from my father

Hello, It's been 6 months that I am in a relationship with a girl. Suddenly, we got intimated in her flat without any discussion about future. After that intimacy, she said love you to me but I said it will be difficult as we both are from different religions and also I am gonna leave this city in 8 months. She agreed and said that no worries, you be with me till this time , be like a husband with me and then you can leave in 8 months. But Some other days(way later than that day), she would ask me about future plans and I would say I am not sure about it as I'll have to fight a lot for this and also I can't see my father in pain as he wouldn't be able to withstand this pain. Now the thing is, She started becoming so abusive and controlling for everything. I cannot go this place, I cannot do this on my own etc etc. She would always ask me to come to her flat and If I refuse then she would be furious and start threatening. Now, on July, 2024 I had to come for my relative's death and I am here still for 20 days and haven't returned to the city yet where I used to live. Now she is asking me to come so I said my father is ill hence he also wanna come with me and live there . But she became so psycho to here it that I couldn't tolerate. She started abusing my father, my entire family and me. She was so adamant that she would say if your father comes then I'll go to police and put you in jail for lifetime that you have raped me. She doesn't wanna hear anything, all she is saying that she wants me with her and If I don't like this then she would destroy my life and put me in prison. She even started blackmailing me of suicidal notes. She started sending suicidal notes on my phone saying that she would send all these to her father or to police and die. She even started saying that she would come to my home and burn herself there or create a big scene and all these. I cannot stay with this kind of psycho girl. Please help how can I get rid of this. She is saying that if your father doesn't agree on marriage then marry me in private by hiding this from my family. and If I don't do this then she would complain that I am rapist. Please help. I have all the proofs where she asked me to come to her flag, hug her, stay with her. Having screenshots of threatening, blackmail and also cussing my father. I am mentally depressed now.