Defamation and Forgery case from arrange marriage prospect

I met this girl on jeevansaathi.com last year. Initially we didn't talk much but over the time we started talking quite a bit. In the same time i was also talking to these other prospects as people most often do in arrange marriage. Now i never met this girl as i was in my hometown the whole time due to some family issues. I went back to my office location in December and there i met one of the other AM prospect i was talking to. I liked the girl and informed my parents about it. At the same time i told the first girl that i don't intend to continue this any further. Now this girl became adamant that i should be with her and that she would do anything to be with me. In fact she even came to my city to meet me but my stance remained the same. She even started threatening me that she would do suicide. I tried to help her move on but nothing worked. Now, after 4 months of going back and forth she is threatening that she would file a defamation and forgery lawsuit against me. I'm really panicked as i clearly told her multiple times that i don't want to take this forward and that she should stop contacting me. What should be my next course of action here ?