My girlfriend's brother filled an FIR against me

I am 27 years old and my gf is 26. In the very beginning we discussed that our future will be difficult as we both are from different caste. We go to restaurants, movies, hold hands, kissed but never get fully physical, and I also never force her for anything. After lockdown she went her hometown, and we chat and talked a lot till July 2020, but after that frequency of talking decreased, and we only chat formally. I also got busy in competitive exams as I became more focused towards job, so I gave her less attention, this was one of the reasons, I guess. We chatted formally till 3rd week of may 2021. (Our friends never know about us ). In the same time I heard from our mutual friends that she was mentally disturb and also his family came to know that she had bf. That time her brother called and abused me and threaten me that he will file an FIR. And now on 26th Aug 2021 her brother told my friend that he filled an FIR against me. What should I do, this will ruin my life...