не нужно было этого делать

didn't need to do this

→ не
phrase Uncommon #19,491
didn't need to do this Used to say that someone was not required to do something in the past. The phrase can also mean “didn't have to do this.”
RU: Мне не нужно было этого делать, но я всё равно помог.
EN: I didn't need to do this, but I helped anyway.