I physically hurt my girlfriend, please help, what do I do?

We was arguing about what she found on my phone so she pushed me because she was getting angry so then i got pissed off so i walked into her very hard deliberately to get past her and just walk away, she fell onto the ground. She has a huge bruise on her legs/chest and a cut on her face. I didn't mean to hurt her.
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I physically hurt my girlfriend, please help, what do I do?
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