After chapter 241, my heart is b r e a k i n g for Yona. Let me show you what I mean.
In chapter 235, we got this moment where Yona begrudgingly let Hak go further into the enemy camp without her and begged him to come back:
Then in chapter 240, we get this (amazing) scene where Yona stands back to back with Hak and pleads to stay by his side, insisting she can fight with him instead of running away:
NOW in chapter 241, we see Yona once again begging Hak not to leave her behind when he offers to search for the dragons:
Of course she is concerned and worried about the dragon's safety, but I think this also cements how desperate she is not to be separated from Hak again. Why do I say desperate? Let's rewind back to chapter 216...
We cannot forget the way she sobbed and wailed and mourned Hak while he was missing. Look at her anguish, her despair.
In this chapter she says, "Even on the night I lost everything, even on the day I took up arms to protect him, the thought of losing him was truly unimaginable. Even if we left for different places fighting different battles, once peace returned...eventually...together..."
This was the first time she genuinely thought Hak might be gone forever. And it terrified her. This is a girl who has gone through so much grief over the course of the story, has learned how to manage it and heal and fight for another day, and yet the possibility of grieving the loss of Hak was something she couldn't fathom living through.
Fast forward a bit to chapter 225, we see the dam break again:
The fear is raw and evident in her face as Soo-won confirms Hak is alive, and then she can't hold it back anymore. She WEEPS. Hak is unconscious, bloody, and broken, but he's there. This is more than relief, this is deliverance from a reality she couldn't muster the strength to accept. The world without Hak would have been the one that tore her apart.
And things have been moving so quickly since Hak has been back, they probably haven't had time to talk about it... aside from a short conversation in The Shed™, they haven't really expressed how traumatic Hak's disappearance was for both of them. And now they're on the move and Hak keeps trying to run into danger without her or tells her to leave so she can be safe, and she is not having it.