Somehow, you misplaced your sense of humor.
It's too soon to say that yet. He was obviously affected by learning that Yozora was his very close friend from years ago. Yozora is trying to display that the past is past and that she wants to move on because he confused her intentions years ago. Combined with her failed "confession" as a result of her being too shy to show off her girl clothes and then him moving away. It is extremely likely that Yozora remains hurt that he took so long to remember her, and is playing it tsuntsun, after that brief glimmer of dere mode. The flashback showing their first meeting from her point of view showed that pretty well. Her shyness keeps backfiring on her, so she's going cold and mean as a means to cover it.I enjoyed this show and I'm so happy it didn't turn out to be Taka x Sora just because they met 10 years ago. That would've been lame
Kodaka is going to keep seeing Yozora in a different light from now on. With the right momentum, it might be inevitable. I guess it really only depends on whether Yozora gets over her shyness and begins to more actively pursue him instead of sticking to the roundabout plan of keeping him near her. No matter how hard Sena may try to break the chain, it's an uphill battle for her now.
We need a second season so that we can get a conclusion.