i forgot if we've met ashina before... 😕
can anyone refresh my memory about him and his relationship with chiwa

I think they used to go out when she was younger....maybe

Yeah, I don't think Asahina has been introduced before chapter 17. As tailor31415 said, based on how shocked they are to see each other in this setting, they probably had a misunderstanding/awkward meeting the last time they've seen each other...