" A fierce battle was raging inside Harry's brain:
She's Ron's sister.
But she's ditched Dean!
She's still Ron's sister.
I'm his best mate!
That'll make it worse.
If I talked to him first-
He'd hit you.
What if I don't care?
He's your best mate! "

― J.K. Rowling , Harry Potter and the Half-Blood Prince (Harry Potter, #6)