The girl, a Class 12 student, set herself ablaze at her house yesterday, Circle Officer (CO), Derapur, TB Singh said.
On a complaint by the girl's family members, Rinku (22) was arrested this morning, he said.
Her family members have alleged that the girl was being continuously harassed and stalked by Rinku, the CO said.
He used to stalk her whenever she left the house. He had also handed her some letters.
Rinku was booked for abatement of suicide. He was arrested when he was trying to leave the district, the official added.
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