My boyfriend slapped me for the first time – what now?

My boyfriend got mad at me because he wanted to show me something on his phone but I told him I was busy playing something

As soon as I said that, he got angry and told me "It's just a visual novel, you can pause it at anytime" and then he gave me the cold shoulder

So I immediately apologized for my reaction, and was getting no response until he looked at me, gave me the middle finger and then he started tickling me as a way of punishment (he always does this when he gets annoyed)

But as I was trying to stop it, he suddenly slapped me in the face...

He told me "Who do you think you are?" and that I was being "rude" to him for telling him I was busy like that

I got surprised by the slap, and told him there's no reason to react that way... And to never do that again... But instead of getting an apology, he answered me with "It wasn't that serious" and that if I'm going to cause drama, it would be better if I went home :/

My boyfriend slapped me for the first time – what now?
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