Cas: quietly Just leave me alone...
Cas: WHY!?
He rounds on Ren
Cas: Why...why are you doing this...?
He's super upset and hurt
Cas sighs
Cas: I...I know. But...I-you-you like him too...and-I...I can't...I can't do this.
Cas: ...so go be with him then. Or be single but-I can't...I can't keep doing this...You...you can't just...
Cas: You're not his plaything, Ren...
He looks Ren dead in the eye
Cas: And I'm not yours.
He starts to walk away again