[He runs a hand through his hair, looking to the side, and exhaling deeply.]

To be honest, I don't like the idea of letting his brother know either. But at the same time...he probably does know more about Dave than any of us. If this is something serious...

And don't talk to Rose like that Karkat. I know you're upset but it's not her fault. I mean, did the thought of looking in a book first cross your mind at all?