It happened just before 10:50 a.m. at the Jake's Wayback Burgers restaurant in the 1600 block of Pulaski Highway in Bear.
Police say an employee's ex-boyfriend, a former employee himself, entered the store.
He began to argue with the female employee.
The two then got in a fight inside the store and the male fled when police arrived.
He was apprehended quickly.
The incident came in as a robbery at knife point from witnesses.
The police say the boyfriend had a knife but did not use it.
Charges are pending