Nothing to do with Ayumu's situation with 知ったことか

Grammar Explanation: Lack of interest with 知ったことか

Sakurako tells Takeru not to go to the shogi club as he’ll get in the way of Ayumu being with Urushi. However, as a new member of shogi club, and as a man, Takeru feels it’s his duty to show up.

タケル:: 「歩(あゆむ)の事情(じじょう)など知(し)ったことか」; "This has nothing to do with Ayumu's situation."