The word pensabas is the imperfect form of pensar in the second person singular. There are other translations for this conjugation.
See the full pensar conjugation

pensar

Y tú pensabas que esta no sería una gran fiesta.
And you thought this wasn't gonna be a great party.
Hubo un tiempo donde pensabas dos veces antes de mentirme.
There was a time when you thought twice before lying.
¿Por qué pensabas que había algo mal en mi matrimonio?
Why'd you think there was something wrong with our marriage?
Pero desafortunadamente, tú no pensabas lo mismo de mí.
But unfortunately, you didn't think the same of me.
La verdad es, necesitaba esto más de lo que pensabas.
The truth is, I needed this more than you know.
¿Qué pensabas que iba a ocurrir cuando cogiste su historia?
What'd you think was gonna happen when you took his story?
Parece que la Guardia no es tan peligrosa como pensabas.
Looks like the guard isn't as dangerous as you thought.
¿Por qué no pensabas así de rápido en el cuadrilátero?
Why couldn't you think this quick in the ring?
Hace una hora, ni siquiera pensabas que había un problema.
An hour ago, you didn't even think there was a problem.
Suena como ustedes están más cerca de lo que pensabas.
Sounds like you guys are closer than you thought.
¿Por qué pensabas que había algo mal en mi matrimonio?
Why did you think there was something wrong with our marriage?
¿Por qué pensabas que había algo mal en mi matrimonio?
Why'd you think there was something wrong with our marriage?
Tal vez no es lo que pensabas, pero lo hiciste.
Maybe not what you thought, but you did do that.
Justo cuando pensabas que no podría ser más despreciable.
Just when you thought they couldn't be more despicable.
¿Dijo que pensabas que tu vida estaba en peligro?
He said you thought your life was in danger?
¿Entonces la película no es tan mala como pensabas?
So the movie's not as bad as you thought?
Bueno, ¿qué pensabas que había debajo, el pastel de boda?
Well, what did you think was under there, the wedding cake?
¿Por qué no pensabas en tu honor mientras aceptabas el dinero?
Why didn't you think about your honour while taking the money?
Vale, pero ¿pensabas eso antes de que yo lo dijera?
Okay, but did you think it before I said it?
Castle, eso no es lo que pensabas hace un momento.
Castle, that's not what you believed a moment ago.
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