Ohhhh he knows that's confirmed noww
The good thing that this means we are likely?? to avoid big heartbreak which would've come when the truth came out...
But I fear we are in for another kind of heartbreak then, if Sasahara says something like "yeah i knew but i pretended not to, just to enjoy while it lasts" and dismisses Kumai's feelings and doesn't believe him.
Looking forward to seeing how this gets resolved.
Thank you for the translation!