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Don’t lose your temper so- so- so quickly
I think that when the singer tells the person not to lose his or her temper so quickly, they are giving the person a quick warning before the song truly starts because they think that the person will get mad at them before hearing them out through this song. They believe that if anything, they deserve for the person to hear their song without "losing their temper so quickly" and that if they do, the consequences won't be pretty at all.