Domestic Violence cases can be a bit tricky. District Attorney's Offices operate under the impression that a large percentage of the time, victims on DV cases end up forgiving their partners, recanting their statements, and become uncooperative with the DA's office overall.
It sounds to me like you are the complainant on the case you're speaking about. If that's the case, the most important thing for you to do, or rather not do at this point is try to contact your partner if there is an order of protection issued against them in your favor. Even if you don't want the order of protection, that order is a COURT order and cannot be waived by anyone other than the Court. If the defendant on the case is found to be speaking with the complainant, regardless of whether the complainant is the one who initiated the contact, the defendant will be rearrested and charged with Criminal Contempt for violating the order. Additionally, if you have a "family relationship" with the defendant i.e. husband/wife, you have a child in common, etc., you may be able to have the order modified in Family Court to make it easier to speak with the defendant.
With that being said, as far as how you can "withdraw" the case, you should get in contact with the defendant's attorney and let them know that you do not want to proceed with the case, and that you are seeking to sign a dismissal affidavit. His/her attorney should then draw one up for you to sign and have notarized. This can oftentimes be helpful in these types of cases. Additionally, if the ADA contacts you, you should let them know that you will NOT sign a supporting deposition or cooperate because you do not want to continue with the case.
Bearing that in mind, you should be aware that the DA's office may not outright dismiss the case even with a dismissal affidavit. Sometimes, particulary in severe cases, they try to prosecute through alternate means, such as using photographic evidence, 9-1-1 phone calls, hearsay statements that are admissible because they are subject to exceptions to the rule, etc.
If you are interested in learning more about domestic violence and orders of protection, I have an article on OOP on my blog that you may find helpful. https://www.michaelschillinger.com/blog/2020/12/understanding-temporary-orders-of-protection-tops/...
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