How to translate some Korean sentences?
I'm trying to translate these few sentences and I kinda get the meaning of the words and phrases, but can't seem to put the whole thing together T_T Can someone help me out?

1. "나는 우리가 평생 할 줄 알았어 요."

2. "이렇게 될 줄 알았으면, 내가 더 잘하는 건데."

3. "단 한 순간도 잘하지 않은 적 없었던, 사랑을 했던 사람이 말했다."

Question

How to translate some Korean sentences?
I'm trying to translate these few sentences and I kinda get the meaning of the words and phrases, but can't seem to put the whole thing together T_T Can someone help me out?

1. "나는 우리가 평생 할 줄 알았어 요."

2. "이렇게 될 줄 알았으면, 내가 더 잘하는 건데."

3. "단 한 순간도 잘하지 않은 적 없었던, 사랑을 했던 사람이 말했다."

Answer

The man who has always been tender, said to his lover, "I think we can stay together for life. If I knew this would happened, I should have been more generous."

If my translation is wrong or not natural, please correct.

Answer

나는 우리가 평생 영원할 줄 알았어요. 이렇게 될 줄 알았으면 내가 더 잘 했을 텐데. 단 한 순간도 최선을 다하지 않은 순간이 없어요.

and I can't understand completely last sentence '사랑을 했던 사람이 말했다'.

Answer

Maybe!  
1 "I never thought we will be continuing."

2 "I knew this would be, that I get better with."

3 "who ever said love was just for a moment could not well."

Answer

I'm actually trying to translate these into English, not the other way around...

Answer

1. 나는 우리가 평생 함께 할 줄 알았어요

2. 퍼펙트

3. 이건 잘 모르겠어요 will you write in english and i try it in korea n