He needn't have lost her vs. He didn't need to lose her

[shootingstar]

Does the sentence He needn't have lost her differ from the sentence He didn't need to lose her as to its meaning?
(respectively He need never have lost her from He didn't ever need to lose her.). If so, please explain to me the different meanings.

 

[jutfrank]

Yes. The basic difference is best explained with a better, contextualised example pair:

I needn't have woken up early yesterday morning. I got into work only to be reminded that I'd booked the day off two months ago.

I didn't need to wake up early yesterday morning. It was my day off so I had a lie-in.

Can you understand the difference?

 

[shootingstar]

Yes, I think I understand. Thank you. The sentence I didn't need to wake up expresses no necessity or no obligation in the past to do something; in this case to wake up. The sentence I needn't have woken up expresses an event in the past, in this case have woken up, which indeed happened but which the speaker considers was unnecessary.

 

[jutfrank]

Yes, you've got it.

 

[5jj]

@JonhDe31, Please note the message @teechar addressed to you in another thread: "Since you are not a teacher, you are required to indicate that in any answers you post on the forum. You can add it to your signature if you wish."