You don't have to lie to me. I know the score.

你不必瞒我。我知道是怎么回事。

《牛津词典》

You can turn me down, but don't lie to me.

你可以拒绝我，但不可以骗我。

youdao

Why would you lie about something like this? Don't you see that it is making it hard for me to trust you?

你为什么会在这样（无关紧要的）事情上撒谎呢？你难道看不出来我也因此很难再对你信任了吗？

youdao