Castiel thinks Dean belongs with him, not Sam

Dean Belongs With Me (You Belong With Me - Taylor Swift)

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You're on the phone with your brother, he's upset
He's going off about something that I said
He doesn't get us angels like you do

I'm in your room, its a typical Tuesday night
I watch you sleep, that's just somethin' he doesn't like
And he'll never know your feelings like I do

But he wears plaid shirts, I wear trenchcoats
He's a hunter and I'm a holy scapegoat
Talkin' 'bout the day when you'll wake up and find
That the God that you seek has been here the whole time

If you could see that I'm the one who understands you
Been here all along so why can't you see?
You belong with me
You belong with me

Walkin' the streets with you in your worn out jeans
I can't help thinking this is how it ought to be
Sulkin' on the park bench thinkin to myself
Why isn't this easy?

And you've got a smile that could light up this whole town
I havent seen it in awhile, since hell brought you down
You say you're fine I know you better than that
Hey whatcha doin' feeling down like that?

He wears workboots, I wear loafers
He kills demons and I'm God's gopher
Dreaming bout the day when you'll wake up and find
That what you're looking for has been here the whole time

If you could see that I'm the one who understands you
Been here all along so why can't you see?
You belong with me

Standin by, waiting by your black car
All this time how could you not know that?
You belong with me
You belong with me

Oh I remember you callin' out my name in the middle of the night
I'm the one who tests your faith when you know you're 'bout to die
I know you think we're dicks and you don't want in our schemes
I think I know where you belong. I think I know it's with me.

Can't you see that I'm the one who understand you?
Been here all along so why can't you see?
You belong with me

Standing by, waiting by your black car
All this time how could you not know that
You belong with me
You belong with me

Have you ever thought just maybe
You belong with me
You belong with me