Did he slap you across the face? You say he slapped you for "something", what exactly? My husband slapped my arm hard when I was teaching him to make pancakes and it shocked me, my brain went into KILL! mode but I had enough presence of mind to ask him "Why?" and it turned out I had been stupid and had endangered the two of us and he was just stopping that. Did you ask "Why?" and see if there was some answer that made sense (if it was not a slap across the face; slapping someone in the face is never right).