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You cant stop charges from being filed, as the crime itself is against the State, even though you are the victim. The strength of the case depends on your cooperation with them. If you fail to return their phone calls or show up in court, they likely will not be able to proceed with the case. If you go to court and ask the DA to drop the charges, you need to present some valid argument. Him having PTSD is not a reason to drop the charges. However, if you version of the story would cause problems in the DA proving their case, they may not want to go forward.