If your partner or ex-partner accuses you of domestic violence, when you have in fact done nothing wrong, by the time the police are involved your ex has already committed a criminal offence for which they could receive a prison sentence of up to six months. If they then go on to falsify evidence to the authorities – the police, social services etc – they are then perverting the course of justice. If the case actually gets to court, and you find yourself in the dock on trial for something you haven’t done, your accuser would in most circumstances have to give evidence in court. If they are still lying at this stage, they are committing perjury. These are all serious criminal offences for which your ex-partner could serve a long prison sentence.