Jack is having a meltdown or something like that,
He's depressed because he's been thinking of Cody a lot recently.
So for a little while, if you ask Jack a question he'll give a negative or sad answer.
Question:
"Naxa, Jack, do you have any crushes?" asked by DragonGirl987
Answer
"Cody was my only friend...i got a question for you...are you really my friend?
(Aw look DragonGirl987 you asked enough questions to become a friend! awww....)