A video recorded by a woman who says her partner punched her in the face has gone viral on social media.
Emma Murphy, 26, from Ireland, says she confronted her partner over a suspected affair with another woman.
"I finally realised that no, this is not acceptable," she told viewers. "It is not right to raise a hand to a woman."
Ms Murphy is a self-employed fitness instructor and mother-of-two.
According to the charity Women's Aid, on average two women a week are killed by a current or former partner in Britain.
Police say they have dealt with more than 1.1 million women and 720,000 men as victims of some kind of domestic abuse in the last year.
The average domestic violence victim is estimated to have been abused around 30 times before they call the police.