What does trebonius say when Caesar tells him to stand by?

When Caesar tells Trebonius to stand by, Trebonius responds by saying, "I will, if you will not." This implies his willingness to support Caesar, but also hints at his underlying intentions as part of the conspiracy against Caesar. Trebonius's role in the conspirators' plot is to distract Mark Antony, allowing the others to carry out their plan against Caesar.