How does Act II, Scene 3 of "Julius Caesar" add to the suspense of the play?  suspense/conflict

In Act II of "Julius Caesar," suspense is enhanced with the action of the short scene because again there is interplay of fate and choice.  Artemidorus, a teacher and dear friend of Caesar's, who is also a friend of some of the conspirators, has learned of the plot against Caesar.  Therefore, he has written a letter which warns Ceasar of the plot, naming the conspirators.  When Caesar passes on this day, the Ides of March, Artemidorus plans to hand Caesar his paper as a suitor looking for a political favor.  Suggesting this very interplay of fate and choice, Artemidorus says,

If thou read this, O Caesar, thou mayest live;/If not, the Fates with traitors do contrive. (II,iii,14-15)

Here, for Caesar, is an opportunity for him to defy the Fates if he only read the letter.