I slapped my boyfriend while blackout drunk, what should I do?

Anonymous
I generally drink in relative moderation, I've only been blackout drunk once before and it's not something I planned on happening again. I had not eaten much during the day, went for a jog and only ate an apple after that before drinking. I drank a couple glasses of wine and a beer, after that only water. I remember dancing at the afterparty. Then I suddenly was in the kitchen. The missing timespan is about half an hour. My boyfriend kissed me goodbye (he said he was leaving early because he had work the next day, which was true.) After that I went to talk to some friends. I checked my phone a while later and my boyfriend had sent me a message saying that it wasn't okay for me to hit him like I did, and that he didn't want to see or talk to me and that I should go home to sleep instead of going to his place. He called me the day after, telling me I bitchslapped him on the dancefloor without reason after him joking something about my shoes. I wasn't angry or anything. I'd NEVER hit ANYONE. Maybe in a non-serious way as a joke, but it seems like I hit him pretty hard. I can't come up with any reason that would make the situation make sense, but apparently I've hit him and he is emotionally very hurt. He didn't want to talk about this on the phone and suggested meeting face to face. I've apologized to him already of course, but that doesn't mean what I did is okay. I didn't drink a lot, and I know I didn't drink anything while blackout either because I didn't have any hangover whatsoever the day after. That means the only thing that would prevent this 100% from happening again is me quitting alcohol altogether, which is what I'm planning to do if my boyfriend decides to stay with me. I am so ashamed for what I've done, and I feel like I should break up with him because he doesn't deserve being in a violent relationship. Advice?
I slapped my boyfriend while blackout drunk, what should I do?
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