Police charged the man last week.
Officers said the pair were arguing about 9.30am on March 7, before the 31-year-old victim decided she should leave.
The 24-year-old man allegedly grabbed her by the arm with such force that it fractured a bone.
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READ NOWThe victim required surgery with metal plates in her arm to repair the injury.
Officers charged the man with aggravated grievous bodily harm on March 14. The man was granted bail under strict conditions not to contact the woman. He will appear in Joondalup Magistrates Court on April 11.