Who is the abuser?

This couple went through therapy because of their problems and was recommend some medicine to help cool down.
One of them had been abusing the other and one day one got tired of it. One of them grabbed a knife and attacked the other. The girl had a stab in the arm and a few mark on the stomach but the boy face was scratched and a stab wound in his stomach through but didn't hit anything bad so he was okay. The police came and automatically assume that the guy was the abuser and the girl was protected herself but in reality they couldn't tell. They both had fingerprints on the knife and they were two different stories. The girl said that he kept beating her so One day she decided to stand up to him and he got mad and lashed out so she got a knife to scare him away but then they started wrestling the knife causing the wounds. The guy said the girl was crazy and she kept hitting him and then one day she thought he was cheating and tried to kill him but he tried to wrestle her away and tried to grab the knife. Who was the abuser? Who picked up the knife? Why do you think they both have knife marks? What do you think happened? Why do think the police automatically assumed that it was the guy? Who do you think was the main cause?

This is a test because I want to see if your like people are today. By your answers I can see how you think. There is a correct answer but what you answer isn't incorrect I will give you the answer after you submit.
Who is the abuser?
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