I wasn't
Yo no estaba contento con tu mal comportamiento.
I wasn't happy with your bad behavior.
I wasn't at your apartment.
Vinieron aquí un día cuando yo no estaba.
They came here one day when I wasn't there.
Yo no estaba listo para esa responsabilidad.
I wasn't ready for that responsibility.
— Vida solo hay una (2011)
Eso habrá ocurrido cuando yo no estaba.
That must have happened when I wasn’t there.
I wasn't there.