MIAMI -- A lover's triangle left one man in critical condition early Tuesday morning after his ex-girlfriend's boyfriend shot him, police said.

According to police, the victim brought a gun to a third-floor apartment at 275 N.E. 25th St. and confronted the boyfriend about his relationship.

The two men began to fight, and that's when the boyfriend shot his assailant in self-defense, police said.

Police took the boyfriend into custody. The victim is in critical condition at Jackson Memorial Hospital.

Their names have not been released.