My boyfriend thinks it's funny to hit me, what do I do?

me and my boyfriend just started dating on the 16th of July. so far during the times I have spent with him he has hit me hard ( not in the face. he says its play hitting and when I asked him to stop he said no and he thought its funny. This is so not funny to me and he has already left a bruise on my arm

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If I have to let him go I will,i ain't gonna let man put his hands on me like that and I don't care if its just messing around.what should I do about this ?
My boyfriend thinks it's funny to hit me, what do I do?
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