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

ser

Esa es la sonrisa que tenías cuando eras un bebé.
That's the smile you had when you were a baby.
George, eras mi esposo y te acostaste con ella.
George, you were my husband and you slept with her.
Frank, se suponía que eras el guardián de mis galletas.
Frank, you're supposed to be the keeper of my cookies.
eras la primera persona en mi lista, sabes.
You were the first person on my list, you know.
Esto vino de tu cabeza, cuando aún eras humano.
This came from your head, when you were still human.
No eres la misma persona que eras hace seis meses.
You're not the same person you were six months ago.
Es solo que, eras el único testigo en el andén.
It's just, you were the only witness on the platform.
No eres la misma mujer que eras hace seis meses.
You're not the same woman you were six months ago.
Elizabeth, tú eras un año más joven cuando nos casamos.
Elizabeth, you were a year younger when we married.
Pero tú eras el único con acceso a la bóveda.
But you were the only one with access to the vault.
Pero no eras su jefe, y dejaron de trabajar juntos.
But you weren't her boss, and you stopped working together.
Siempre he dicho que eras una amenaza para esta ciudad.
I've always said you were a menace to this city.
Stepan, dijo que tu eras un error de su juventud.
Stepan said that you were the mistake of his youth.
El jefe me dijo que no eras como el resto.
The boss told me you were not like the rest.
Me atrevería a decir que eras un hombre de acción.
I'd venture to say you were a man of action.
eras su mejor amiga y yo era su novia.
You were his best friend and I was his girlfriend.
De todos los huérfanos, tú eras siempre el más triste.
Of all the orphans, you were always the saddest.
Tu abuela siempre dijo que eras una mala semilla.
Your grandmother always said you were a bad seed.
Pero, es decir, tú eras una estrella en tu campo.
But, I mean, you were a star in your field.
No era un plan— eras tu, esa es la verdad.
It wasn't a plan... it was you, that's the truth.
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