Police said a University of Miami student was visiting his girlfriend at FSU's Deviney Hall when she told him she was interested in another man who lives in the same dorm.
Police said the U-M student went to that man's room around 10:30 Sunday morning and attacked him.
The man attacked pulled out a knife and stabbed the U-M student in the back.
FSU police said the U-M student, 19-year-old Luis Pinto, faces potential burglary and assault charges.
He's been treated for his injuries.