Is deliberately cheating a criminal offence?

I have been in a relationship with a girl for almost two years. We started talking on 1st April 2020. We knew each other beforehand. At first I was hesitant to get into the relationship. However she convinced me into this. But before committing I made it clear that I have marriage in my mind. She promised to marry me and even had future planning a together. I've provided every possible mental, emotional, physical, psychological, financial support. I even helped her preparing for her PhD. Arranged resource persons for her topics. I convinced her to apply for the university which she is pursuing her degree right now. She was reluctant to go there previously. I convinced her that it is India's one of the best institution and the exposure she will get there is huge. We had physical relationship too. But she cheated on me for a professor in her department. She never told me that she has developed a feeling and then slowly started distancing herself from me. But now she is saying that she never loved me but stayed with me because she felt bad for me. I have introduced her to my family. She stayed at my place with my family for three days. Even after breakup when I asked her not to contact me anymore she kept texting back to tell me that she has started dating. I am mentally, emotionally, psychologically devastated. Please help me how to get this case going?