Now, I am not defending Amber here. It sounds like she was abusive towards Johnny, but it also seems that he was abusive too. I think this is one of those rare cases where they're both as bad as each other.
However, as a feminist, I am concerned about the narrative people are pushing with this case. Despite the evidence, Amber seems to be getting a far harder time. There's also lots of "See! Women are just as abusive as men!" rhetoric swimming around.
Men who admit to abuse aren't treated half as bad as Amber is being right now. It's like the people watching want her to be as abusive as possible.