What legal action can I take against my former girlfriend for constantly threatening me after break

I was in a relationship with a muslim girl for past three years. At the beginning everything was all right. I even promised to marry her. After 1 year, Slowly i understood that marrying an muslim women will be disaster. Besides later i that year my family faced terrible financial. I was the only son. I am studying computer science in a renowned university in bangladesh. My girlfriend and i were in same class. Being the only son of the family i had vast responsibility. Bit I was unable to do anything for my family as well as for the girl. I started feeling guilty for my works and inability to do anything fir my family. Later I decided that i will break up with the girl and concentrate on my studies and will try to help my family. I the mean time the girl was putting tremendous amount of pressure on me. Finally i said that i will no longer be able to continue the relationship. First of all the girl started crying. Then she threatened me and said that she will commit suicide. I requested her many times to not to do that. Then i slowly tried to keep no contact with her. She was threatening me on that period also. After that she contacted random people of my facebook id, and asked about me. I was forced to contact with her. Then again i said that i don't want to keep relation with her. Now she is threatening me that she will go to the police(i would like to mention that many of the relatives of this girl is in politics and one of her brother is in police also). She wants to take legal action against me and she wants to marry me. I would like to mention that we never had proper sex. She invited me to her home thrice and we had some sort of foreplay type of thing but we didn't had sex. My family is in tremendous financial problem. I don't think they have the amount of money and man power to face terrible situation like this. What can i do now? What kind of steps I can take to get rid of this kind of problem. I know i did wrong things ,but i want to be back in a normal life and help my family. If i marry this time it will only bring a disaster for everybody. Please help me, I am in dire need of help. Any kind of suggestion will be helpful. I Please suggest me what actions i can take to solve this problem.