arruinases
-you ruined
The word arruinases is the imperfect subjunctive form of arruinar in the second person singular. There are other translations for this conjugation.
See the full arruinar conjugation

arruinar

Así que dejé que arruinases tu carrera.
So I let you ruin your career.
Porque no quería que lo arruinases al igual que todo lo demás.
Because I didn't want you to ruin it just like everything else.
No queríamos que te arruinases de ninguna manera, así que hicimos lo que teníamos que hacer para seguir adelante.
We didn't want to derail you in any way, so we did what we had to do to keep moving forward.
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