I left my abusive boyfriend a year ago as I could not stand his mental abuse and manipulation. We were in relationship 6 years in between which we stayed in live-in for brief period (less than 3 months in total) 4 years ago. He is now threatening me that if I don't go back to him he will file a case of cheating and false promise of marriage on me. When in real it was he who first promised to marry me and I agreed. However, I could have mention somewhere in chat messages that I want to marry him, which he can manipulate and present. He has kept all my messages since the beginning. What can he do in real?