• False case of harassment

I was in relationship with a girl for 1.5 years. Suddenly she just broke up without any proper reason. I called her, messaged her and tried to reach out to her to find what went wrong that she suddenly is behaving like this. She blocked me from all sorts of communication. After a few days, I went to meet her and check what were the reason for her such abrupt and unexpected behavior. She told that there are some family issues. She made me talk to her mother regarding that and her mother told that they don't support inter caste marriage. He mother was aware of our relationship since past 7 months and was in support of our relation so we went ahead with it. Now the girl says that she likes someone else and I am harassing her by contacting her. She threatened police complaint and told that she will use all my messages, etc to justify her case. If she liked someone else while being in a relationship with me to the point that she made me talk to her mother regarding marriage, etc. Isn't liking someone else amidst all this actually cheating on her part? I tried reaching out to her close friends to find out if there is an involvement of other guy or there are family issues alone. To this she went furious and started calling my parents and threatening harassment case, etc. Given the fact that my full family and her mother were fully aware of our relationship and the relationship was going smooth and was serious to the point that just before all this, we were doing family planning and discussing life after marriage, designing our new house, etc. can she file a harassment case and use the legal system against me? If laws are supporting her, is there a way out to get some sort of immunity/protection from such cases? If I go to her place to meet her, can she still file an FIR? Is there any kind of way out of this? If there is an involvement of other guy, can I file a case of cheating? She repeatedly threatens me with police complaints, FIR, etc.