Its actualy a permanent step of progress for the two on their relationship.
The main issue wasnt exactly communication, it was willful ignorange on Kyo's part. He literally admits to it here and in the previous chapter realizes where he is failing by focusing too much on himself and not enough on how she feels.
This arc heavily relies on knowing the subtext of those two and how they think, react, and more importantly; how surprisingly well they are at reading each other.
Anna isnt a subtle girl at all(in many different ways lmao) and Kyo is pretty good at noticing her on topof that, communication wasnt the problem. He was keeping her at arms length for a long time and she was feeling incredibly lonely for it, yet, the ever so selfish and un-subtle Yamada Anna still bit her tounge and held back for his sake. While he was fully devoting himself to studies and neglecting her, he suddenly goes to hang out with a couple very attractive girls and hangs out with them.
He didnt tell her cause he felt guilty about betraying her like that. He knew why she was upset but wasnt being honest (hence the repeated "be honest" past chap). She knew he knew and was dissapointed he was still keeping her at arms length.
Anna is needy and clingy AS FUCK, she's self aware and tries to keep it under control but it still hurts. TLDR: she was just sad that he gave others priority and was still keeping distance from her.
PROOF it wasnt a communication issue: Kyo knew exactly what to say to get her attention, then said what he had to after getting it.
