Why does this sentence use fuiste (ser) instead of estuviste (estar)? I would think "to be direct" would use estar, since (at least in this case) it's a way of acting, not a personality trait.
I see your point, but the sentence isn't commenting on her personality. It's just saying what she did.
Not according to the lesson. I lost a heart for 'very', so I assume that 'muy directa' is idiomatic and just wonder whether there are other idiomatic uses of 'muy'.
I translated the sentence as "you were very direct to him" but lost a heart because it supposed to be "you were very direct WITH him". So it did translate it as "very direct" and I guess it depends on which sentence you use? But ok, I'm not sure...
I don't understand how this verb can be both "ir" (to go) and "ser" (to be) at the same time. My previous usage of fuiste in this exercise was always equivalent to "You went to the castle," etc, and now it becomes "You were..." which rightly seems to be more in line with "estuviste."