Speak to the prosecutor in the town that has the case. They will likely let you drop the charges. They cannot prove the case without your cooperation. He may have to do anger management first but it sounds like that will not do too much harm.
It sounds like you would benefit from an in person consultation with an attorney.
NY Criminal defense Attorney
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The prosecutor may dismiss the Complaint, contingent that there are no physical signs of injury ("fresh" black and blue markings, cuts, some type of markings that would indicate someone was hit.), and/or you did give a statement to the police following the incident. Now, if you did give a statement and there are physical signs of injury, you can tell the prosecutor that you do not want to move forward, however, the Complaint more likely then not, was signed by the State and the prosecutor may have enough evidence (police observation, pictures of yourself, pictures of the Defendant, and your statement, ) to proceed without you or force you via subpoena to come to court to testify.
If the Defendant files a complaint against you, you need to obtain an attorney asap.
The information is for general information purposes only. Nothing from this comment should be taken as legal advice for any individual case or situation. This information is not intended to create and does not constitute an attorney-client relationship or a prospective attorney relationship.