How can one assess this dynamic between my brother and me?

I don't quite understand it.

I am 26,m and I have 3 siblings, all of whom I love very much, but this is about my younger brother, he is 22, will be 23 in 2 months.

Yesterday, something gave me a panic attack and I went berserk. It was just before midnight. I called him and he asked if everything was okay.

And he immediately noticed from the way I spoke that I was panicking and scared again, and then he immediately came to me to calm me down, to be there for me and to comfort me.

He's actually really sweet, and he also provided a lot of emotional support when our grandfather died.

Sure, he was sad too, and we're all there for each other, but he was extremely, really extremely stuck in his emotions, as if he couldn't fully accept them.

He's always a rock when I'm losing control or panicking. And he's so incredibly caring. I want to be there for him, too, but he always acts like everything's fine.

I notice sometimes when something is bothering him he can play it off so damn well and still focus on everyone else but not on himself.

Isn't that funny?