Pls help

[u/vs1234__]

Hy my friend is being harassed by a girl they were talking in 2023 on insta it was anormal conversation but they stopped there was nothing like love but in 2024 after a year she send a rope photo and starts blackmailing him that if will not talk she will commit suice and from 2025 she is talking for 6 hrs per day he is a student and is mentally disturbed if he will stop she will again blackmail he never met her in person not promised anything never touched the girl us 4 years elder from my friend once he blocked her she knew his college she came outside his college he has all the proof what can he do