His legal team claims the entire thing was recorded and the video proves his innocence. We will have to see how it plays out, but as
@UncleTrvlingJim stated domestic violence victims can refuse to testify, but they can't choose to press or drop charges. This is intended to combat the form of Stockholm Syndrome many abused women have. So she can't prevent charges from being filed and if there is in fact video they won't even need her testimony.