Why does Shakespeare make Caesar change his mind so often in Scene 2?

From what we know of Caesar's death and the history of Rome, it seems that Shaakespeare was following suit when writing his play. Caesar lived in a world of superstition and prophecies. The soothsayer.... his wife's dreams, all of these things served to make Caesar unsure of his actions.... he tottered back and forth about what to do, and in the end, he did exactly what he'd planned all along. I believe that Shakespeare wanted his audience to see this very real aspect of the man.