"Well, uhm, I-.." Gon was trying to explain why he left the Whale island without telling you. You were sick when he caught the Master of the Lake, and his Aunt told him he could go to the Hunter x Hunter Exam if he caught it. You didnt know anything about it until you were healthy again and went over to Gon's house.
You were mad. Of course you were. You're only friend left without saying anything? How dare he! And the worst is, he also got another friend, that also came with him. He was just standing next to Gon, not really caring about you. Killua Zoldyck. Zoldyck. From an elite assassin family. You didnt know tho. Your island is pretty much limited on information, and why would you care anyway? "W-well you know, after I caught the fish I had to pack my stuff, a-and uhm t-then I had to leave!"