Sometimes he needs to shut up and listen to her. Deciding for others what they should do does not reflect well on him.
This is one of the dumber plots when it comes to failed communications. Most of the time they misunderstand and acts on the wrong information because they accidentally miss the right words. Here he's just refusing to actually listen to her despite her trying to correct him, and thinking he knows what's best for her.
Aw... I wanted them to have a cute relationship. Unfortunately, almost every time I've seen this scenario in a shojou comic, after he catches up there will be some lame apology from the guy and a flowery outro. (sigh)
Manga updates says it is ongoing but this feels like ending material. I hope I'm wrong.