Also, Jaehyuk seriously needs some kind of anger management
He is CONSTANTLY kicking, punching and smashing things when upset. The author has shown they can depict anger in different ways, so it's 100% an intentional characterization of Jaehyuk.
I feel like it's kind of brushed over because the impact of those actions in a still and silent medium like a webcomic isn't as realistic as if you were to actually hear and witness just how violent those actions are.
When you start slamming shit around, you take over the conversation, conveying with your whole body that you're emotional and not listening
aaaaand when someone is in that heightened, emotional, angry and violent state, the answer is "leave and cool off"
The way Jaehyuk came back smirking, totally thinking that now that he's no longer actively angry, the fight's over and it wasn't that serious and they can just move on.
He's not actually thinking about or even hearing Garam's concerns when he speaks them. He just gets angry. He gets angry and stops listening.
Which means he's not paying attention to how Garam feels at all. All he knows is Garam is upset and that he disagrees with Garam so now he's angry. He isn't considering why Garam is upset or anxious or any of that
BECAUSE HIS HEAD IS SO FAR UP HIS OWN ASS ISTFG
Yes, Garam physically left
But now he is communicating about the situation, just like he needs to. He gathered his thoughts and is expressing them. Overall, his behavior can be seen as avoidant but I don't thinks it's to a problematic degree.
He's not just "running away". He said it himself -- he's looking for some space. Some time to cool off.
He is uncomfortable with certain aspects of their relationship. He puts distance between them and then communicates. And instead of listening and thinking and growing, Jaehyuk gets angry and lashes out. EVERY FUCKING TIME.
He is genuinely so immature, it's ridiculous.
Garam is reacting due to unhealed past trauma, yes. He needs to grow and heal but ultimately, the way he's acting is totally reasonable. But Jaehyuk genuinely acts so spoiled and reckless, it's ridiculous.
His behavior is genuinely concerning and it's really refreshing that Garam is speaking up about it, because he cares about Jaehyuk.
They haven't been together that long and their start was rough, but Jaehyuk is literally willing to throw every part of his life down the toilet if it means being with Garam. That's scary. That's self destructive. That's not healthy.
Even the way he phrases it, telling Garam he threw away job opportunities and cut off his family all for him. That's so uncomfortable and saddening and burdensome.
Jaehyuk neeeeeeds to get his head on straight (exhibit A: the title lol) because if Garam is going to let himself heal and be close to someone, that person needs to be stable with healthy connections. In a relationship, you want to be able to build a life up together and you never want to feel like you're dragging your partner down to your level.