Read it through once

"I've had something preying on my mind, uncle, and as I am going away, and might never see you again, I can't bear it any longer. I made you believe I was afraid to fight that Italian adventurer. I had to get out of it on some pretext or other, and maybe I chose badly, being taken unawares, but no honorable person could consent to meet him in the field, knowing what I knew about him."