Ex boyfriend not leaving my friend alone

A close friend of mine is getting married in February and her ex who was abusive towards her to the point that he even hit her is now posting on his instagram their old pictures together. He even commented on their Engagement video on the photographers page that “you dont know this yet but you will be my bride in 2025” the reason she did not wanted to Report him to the police previously was because she thought it will ruin his future but now she is scared that he might ruin her marriage. She is now engaged through an arranged marriage situation and her fiancee is really understanding so he knows what is up but his family wont be so understanding. Just wanted to ask if we can do anything I told her to speak to his parents and tell them if he doesn’t stops she will report him to police. Is there anything she can do ? Any advice would be helpful. And for context they broke up more than a year ago. Update: I have convinced her to file an FIR thank you for all the support and fuck you to everyone who thinks her husband is suffering in anyway because of this when he is completely good.