Hogy van angolul, hogy "nem lett volna muszáj venned"?

needn't have (done) compared with didn't have/ need (to do):

needn't have done: no obligation but action performed (unnecessarily), i.e. time wasted:

You needn't have watered the flowers, for it is going to rain. (You wasted your time.)

didn't have/need to do: no obligation, and normally no action:

I didn't have to translate it for him for he understands Dutch.

Some people do use didn't have to/didn't need to for actions which were performed. The have or need is then usually stressed: You didn't \have to give him my name would then mean 'It wasn't necessary to give him my name, but you gave it to him'. But the student is advised to use needn't have + past participle when an unnecessary-action was performed:

You needn't have given him my name.

(Thomson-Martinet)