The couple had allegedly consumed poison before jumping into the well in the wee hours this morning.
The girl Manohari has died, while the boyfriend Omprakash (25) is under treatment in a hospital here, police said.
The girl, a student of class IX, was residing with her grandfather Pema Ram in Sawaipura village. She was in love with Omprakash but her family was against the relationship.
The incident came to notice this morning when Pema Ram woke up and found the girl missing.
He looked for her and found that she was crying inside the well near the house. The two were then pulled out by the villagers.