I hit my boyfriend then he bruised me bad but I left no mark on him. What should I do?

Anonymous
Me and my boyfriend have been dating for a little over 2 years. Last night he came over to stay the night and he saw that I asked a guy a question about school that my boyfriend hates. Well after that he posted abunch of Inappropriate pictures of me to his snapchat so I got furious and tried to take the phone away from him and pushed on his face then I saw him post another one and so I punched him in his shoulder but not hard then he went crazy and grabbed my arm then hit me and grabbed the side of my chest and hit me again then kicked me so I ran to the bathroom and looked cuz my arm and side of my chest stung really bad (still do the next day aka today) and saw that he left huge bruises on my arm and side of my chest and there really dark blue and purple like REALLY dark. I'm scared to tell anyone. What should I do?
I hit my boyfriend then he bruised me bad but I left no mark on him. What should I do?
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