青春一去不回头。

As it will not return once gone.

youdao

当初我们说的天长地久，和现在你的一去不回头！

Initially we say the everlasting, and now your gone never to return.

youdao

可能我要用一辈子才能弄明白这两件事：当初我们说的天长地久，和现在你的一去不回头。

Maybe eI'll take a lifetime to understand these two things. Initially we say the everlasting, and now your gone never to return.

youdao