Why does my friend keep hitting me?

Your_boss960
So my friend was helping me do my work for more than 30 minutes. Then she said: "so, who are you going to say thank you to?" I said: "why are you asking if you already know the answer?" She looked really offended. So when I was drinking water she hit the end of the water bottle really hard. And now I have a cut on my lip. Then she said: "that's what you get for being mean."

She also keeps pushing me around, and I've started pushing her too because she does it to me. I don't know what to do. She is so violent everyday.
Why does my friend keep hitting me?
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