I am not really seeing a question in here. But for general knowledge, Domestic Violence charges can have serious repercussions and should be taken seriously. I would strongly recommend that the person who is charged speak with a criminal defense attorney right away. If they cannot afford an attorney they should request a Public Defender.
Situations similar to what you are describing happen all the time, unfortunately. What he needs to do is hire a criminal defense lawyer as soon as possible to get working on his case. This may not get settled prior to having a trial. If he cannot afford to hire a private attorney, he needs to hire a public defender.
I agree with my colleagues and will add that in cases where the accuser is really the perpetrator and the police and prosecutors get it wrong as a result of false reporting and perjury by prosecution witnesses, it is critical that the defendant be represented by competent defense trial counsel and hopefully, counsel can conduct a thorough enough investigation of the circumstances and witnesses to be able to bring out persuasive evidence of the truth during or before a trial.