Cause it was not said to you.

因为我不曾对你说过。

youdao

But if I tell the world, I'll never say enough 'cause it was not said to you and that's exactly what I need to do if I end up with you.

但若我告诉世界，我永远也说不够，因为我还没告诉你而且那就是我将与你一起共度余生时需要做的事。

youdao