It is not your decision to make. The District Attorney will decide whether or not to press charges. You can call the D.A. and let them know your feelings.
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The courts are very intolerant of the situation which you have described. In most cases, the prosecutor will not drop the charges. You will be summonsed to court to testrify against your ex. If you do not show up, then most likely the charges against him will be dropped, however, the court could pursue charges against you for abuse of process and wilful and malicious prosecution.
Based upon what you described, he committed CDV.