[They're in an okay place, then? As long as they're okay, Chekov can work out whatever else he feels on his own time.]
I overreacted, also. [Maybe he isn't as fine with how today has played out as he expects himself to be and heard his own insecurities in Kitty's words. Was it jealousy? That isn't an emotion he has had to tangle with; he hopes it wasn't.] You don't need to apologize.