The 22-year-old man and the girl had met and fallen in love in Singapore where they had gone for further studies. After promising to get married, the accused took intimate pictures of them and that of the girl alone, a police official said.
But when she started to interact with other men, the accused threatened that he would leak the pictures online, which he eventually did, the official said.
Unable to cope with the humiliation, the girl came back to her house in central Delhi's Patel Nagar and informed her parents about the entire incident.
The girl has also alleged that the man has leaked her intimate pictures since his parents had asked him to do so, police said.
A case has been registered and probe into the matter is on, the police official said, adding both the victim and the accused are now in Singapore.
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