If he is, we'd know by now. He often approaches me for advice.

[Or, alternatively, Atsushi would've tried to hide it, get caught because he was a terrible liar, and spill the beans.]

No, if he's suspicious of you, that would be because of me. I'm not the most forthright individual, so our proximity [read: dokis and sleepovers] will make him curious.

Believe me when I say that if he doesn't like you, you'll know. He's not someone who hides his dislike of a situation.