the relationship between boss and me

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one day i refused my boss's demand to change the night shift with my colleague,the key point is that i promised his idea the day before yesterday,as a result,he seems to be angry to my action.today,he shouted to me and ask what i was doing in the office,which is so usual before,i was so confused about it,the relationship between us is becaming more and more alienation,how can i do next step?who can help me out this embarrass situation?