Why should I know you?

“I know this isn't your real identity. When?” Andy didn't conclude his sentence, but he figured out that Hayden would understand.

Andy never had a close enough person who didn't befriend him because of his identity, except Hayden, so he didn't want to lose the beautiful friendship he had built with Hayden. He really trusted Hayden, and he hoped Hayden did so, enough for him to reveal the truth about him to him (A).

“I think of you as a brother, but when next we meet, I'll tell you everything,” Hayden said with a sincere expression which caused Andy to grin happily with a hint of slyness.

Suddenly, Hayden thought of something. With Andy knowing where he's leaving, Hayden doesn't doubt that Andy would run after him, saying it was a coincidence, so Hayden can tell him the truth.

Hayden immediately scoffed at the grinning Andy. “Don't even think about doing so in less than 3 months will get me to reveal everything to you.”

Andy immediately rolled his eyes after Hayden said the senten