не нужно было этого делать

didn't need to do that

→ не
phrase Uncommon #20,801
didn't need to do that This construction says an action was unnecessary, not impossible. The subject is often expressed in the dative: мне не нужно было means “I didn't need to.”
RU: Мне не нужно было этого делать.
EN: I didn't need to do that.