The boyfriend, Justin Taylor, of Upper Darby was treated for puncture wounds to the left arm.
The Delaware County Times reports the girl is at the county's Juvenile Detention Center charged with assault and related offenses. Her name has not been released because of her age.
According to police Superintendent Michael Chitwood, the teen became angry with her boyfriend for flirting with other girls and stabbed him.
Taylor was arrested for statutory sexual assault and corruption of minors.
He was detained in lieu of posting bail pending a preliminary hearing. Friday. It couldn't immediately be determined whether he had an attorney.
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Information from: Delaware County Daily Times
