Lyric discussion by foundthevelvetsun7 

Cover art for Judas lyrics by Kelly Clarkson

Yeah, I definitely think it's a metaphor, like some others have said, that she's using to describe someone she was close to (like a friend, maybe businesslike?) who betrayed her.

Love the song, and the guitar, but not too big about the rhyming chorus. ("I couldn't see, I couldn't see" "How you deceived, you deceived")

The metaphor is why she says "your only brother", since Kelly couldn't be anyone's brother... ;-) LOL that was unnecessary.

--Mari