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

existir

¿Qué hubiéramos hecho si no existieses?
What would we have done if you didn't exist?
Es como si ni siquiera existieses.
It's like you don't even exist.
Pero preferiría que no existieses.
But I'd prefer if you didn't exist.
Ni siquiera sabía que existieses.
I did not even know you existed.
Es como si no existieses, Tu sabes?
It's like you don't exist, you know?
Es como si no existieses.
It's like you're out.
Y si no estás con él en esa minúscula, pequeña burbuja, entonces es mejor que no existieses.
And if you're not with him in that tiny, little bubble, then you might as well not exist.
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