When the police arrived at the scene, they found a man holding a piece of his left ear and another was arrested and charged with aggravated assault, the authorities said in Phoenix this week.
Edward Anthony Lopez Gomez, 25, is believed to have bitten the ear of boyfriend Marcos Brito because of betrayal.
The victim said he had been having a relationship with the suspect for three years, according to AZFamily.com. Brito said his relationship with Gomez was "a roller coaster".
Brito was transported to a hospital where he underwent surgery and the doctors were able to reattach his left ear, reported the station.
Gomez faces a charge of aggravated assault.