quote referring to the supernatural scene with dean and cas in the car:
Dean: Hey, you okay?
[pause, Cas stares straight ahead, not answering]
Dean: Look, I'll be the first to tell you that this little crusade of yours is nuts, but, I do know a little something about missing fathers.
Castiel: What do you mean?
Dean: I mean, there were times when I was looking for my Dad when... all logic said that he was dead. But I knew, in my heart, that he was still alive. So who cares what some Ninja Turtle says, Cas, what do you believe?
Castiel: I believe he's out there.
Dean: Good. Then go find him.
Castiel: What about you?
Dean: What about me? I don't know. Honestly? I'm good. I can't believe I'm saying that, but, I am, I'm, I'm really good.
Castiel: Even without your brother.
Dean Winchester: Especially without my brother.
[Castiel looks at him]
Dean Winchester: I mean I spent so much time worrying about the sonofabitch... I mean, I've had more fun with you in the past twenty-four hours than I've had with Sam in years. And you're not that much fun. Funny, you know, I've been so chained by my family, but now that I'm alone... hell, I'm happy.
[smiles, looks over; Castiel is gone]
I guess Dean's not exactly saying he's happy with castiel being there, but "I've had more fun with you in the past twenty-four hours than I've had with Sam in years" just didn't look good