The girl, a resident of Ramgarh in Sikar district, was living in a rented room at Raghunathpuri area here. She was in live-in relationship with Raju, a cook in a hotel, for past two to three years, the Jhotwara police said.
The girl ended her life by hanging self from a ceiling hook yesterday.
In the suicide note, the victim alleged that Raju used to beat her frequently, hence she took the extreme step, the police said.
The body has been sent for postmortem, and police were waiting for her mother, who was reportedly living in Bengal, to hand over the body.