It is not a pre-determined outcome that every person charged with a crime will be convicted at trial. There have been books written on cases where not guilty verdicts have been reached due to strong work by the defense team, despite popular opinion and bodies of evidence that would point to the defendent's factual guilt.
The conviction rates for DV is very low. Not all dv calls result in arrest. Not all dv arrests result in charges. Not all dv charges result in convictions.
In 2005, the the North Carolina Center for Public Policy Research found the conviction rate for DV was 33% statewide, with rates as low as 12% in some counties. Failure of the victim to cooperate in court proceedings was the most common reason for dismissal of cases.
You may think you are in the unlucky 33%, but a significant number of defendents have a different experience then you.