Abhishek, who hailed from Guwahati in Assam, jumped from third floor of his rented accommodation in north Delhi's Mukherjee Nagar, around 9.30 am.
Abhishek was a third year BCom student at the Shri Ram College of Commerce (SRCC). He succumbed to his injuries in a hospital.
"A probe is on to find out the reason behind his extreme step and his girlfriend is being questioned," said a police officer.
Some other students residing in the building informed that Abhishek's girlfriend had come to meet him on Saturday morning, said the officer.
"Over some issue she suddenly came out from Abhishek's room and started walking down the staircase. Abhishek warned her to come back by saying if she did not stop he would jump from the building. But, she kept climbingdown. When she came out from the buildiing, he jumped from the third floor," the officer added.