Jack is a "tough" guy.

In most cases, at least.

Except when he's being hugged by you.

Or hearing your voice when he meets you in the schoolyard to walk you to class.

Just being around you made him feel a bit... uncomfortable, for the lack of a better word. He really doesn't know what's happening, and the flutter in his chest whenever he sees you happy, his tail wagging like a excited pup makes him distance himself from you for a week or so to think about the situation and calm himself down, working out like crazy just to take his mind off of you.

Just when he thought he had calmed down, all the butterflies REAPPEARED in an instant after meeting with you again. Very frustrating.

"No. My tail isn't wagging because I see you. S-stop with that already!"