GF filed case of false pretext of marriage

My friend was in a relationship with a girl for about a year. However lately he wanted to breakup off the relationship becoause of constant disagreements between them. When he informed this to the girl, she took ot quite badly and went about informing about the relationship and their physical intimacy to the guys mother in hope of shaming him a bit more. However when the parents ( though shocked due to the Indian mindset) were fine with this as it was a consensual act. She then went about threatening to file a police case of false pretext of marriage if the guy doesn’t marry her. My friend did not agree to this as he did not want to continue this toxicity. Now the girl has gone ahead and filed an FIR and my friend is now arrested and awaiting bail. What are the things he can do on this scenario.

Edit: I am new to this subreddit and dont know if I am breaking any rules.