you were the one who
Tú fuiste quien eligió hacer eso.
You were the one who chose to do that.
Espera, Teshi, no me digas que tú fuiste quien escribió en mi libreta.
Wait, Teshi, don't tell me you were the one who wrote in my notebook.
— Tu nombre (2016)
Y tú fuiste quien me descubrió en clase.
And you were the one who discovered me in class.
— Los 400 golpes (1959)
Tú fuiste quien les creyó lo del comunismo.
You were the one who made them believe the communism.