(CNN) - Karen Bermudez-Rodriguez sent her boyfriend a text about 2 a.m. last weekend, breaking up with him and demanding he return the key to her employer's house in a New Jersey suburb. Her boyfriend responded immediately, saying he was upset about the end of their relationship, authorities said. Bermudez-Rodriguez worked for Kimowitz and his wife as a nanny to their two children, according to the criminal complaint. Her boyfriend is arrested at the airportProsecutors allege the nanny's boyfriend, Joseph D. Porter, entered the Kimowitz home on August 3 using her key. Police said they responded to the scene after a 911 caller described seeing a woman bleeding on the street.