My boyfriend slaps my face in a joking way. He says he's only playing?

He slaps me everytime I say something he doesn't like. I tell him to stop and he keeps doing it. He says he's joking but I think he still upset that I hit him upside his head onetime because I found out he had a three some..
My boyfriend slaps my face in a joking way. He says he's only playing?
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