I was under the wrong impression
間違っていた
Was mistaken
I was mistaken
勘違いしてたわ。
I had a misunderstanding
I had a misunderstanding
私は勘違いした。
I misunderstood that.
I was mistaken about that.
I am mistaken.
I was mistaken about that.
I am mistaken.
I have done wrong unwittingly―without knowing it.
I was mistaken about that.