I swear (that) I'll never leave you.

我保证决不离开你。

《牛津词典》

Now I shall never, never leave you again!

现在，我绝不，绝不再离开你！

youdao

Lina said to Fundevogel,"If you will never leave me, I too will never leave you."

莉娜对鸟弃儿说：“如果你永远不会离开我，那么我也永远不会离开你。”

youdao

Can you lead the tracker away from here? No, Edward.James knows you would never leave Bella.

VOA: standard.other

If I want to persuade you that I love you, would never leave you, you can trust me with everything, it may be a superb tactic for me to believe it.

如果我想让你相信我爱你，永远都不离开你，你什么都可以信任我，或许最好的策略便是我自己对此深信不疑。

耶鲁公开课 - 心理学导论课程节选

It starts to seem axiomatic that once you let violence into your life, it will never leave you alone.

NPR: 'A History of Violence': A Ticking Timebomb

Then you can focus your energy on the core client group, and keep these folks so happy that they will never leave you for the competition.

FORBES: 5 Ways to Keep the Right Customers for Your Startup

You never really notice this until you leave the country, whereupon the white noise suddenly stops.

NEWYORKER: Hack Work