I swear I love you only.

我发誓我只爱你一个人。

youdao

I swear, you are the only one in my life I love.

我发誓我今生只爱你一个。

youdao

Well, do it for me, for I swear that I do not love you as the others loved you.

那么，您就给我吧，因为我对您起过誓，我爱您跟别人爱您不一样。

youdao