Harassing And Torturing For Past Issues Which Wasn't A Problem Back Then.

I had a physical relationship with a girl (let she be X) who had just undergone a breakup.At that time she had no problem with it and later i fell in love with her. But she didn't accept my proposal instead insulted me for asking the same. Showed my love to her in various ways but she never gave any kind of affection towards me. She had another physical relationship with her friend at the same time. Even that didn't stop me from loving her. But she never accepted my love. Soon i realized this wont work and made my mind to drain off all the feelings i had for her. Later i fell for another girl and got committed. At this point the previous girl (X) started to torture me by saying i ruined her life by physically using her back then.At first she used to call me and torture later on she started to torture my girlfriend. Its been 1 year still she messages me by saying i ruined her life. In between she got committed to our mutual friend. But still she does the same. Before i have helped her in many ways, even financially whenever she asked. Within this 1 year she edited the story according to her needs. Soon i'm getting married and i don't want this to continue. I wanted to know what all will happen if i file a case for harassment.