最糟糕的感觉莫过于被一个你永远忘不了的人遗忘。

One of the worst feelings is being forgotten by someone you will never forget.

youdao

我永远也忘不了你对我的好处。

I shall always remember your kindness to me.

《新英汉大辞典》

显然，那种恐惧会深深地根植于你的心中并很可能让你永远都忘不了那悲剧的一幕，事实上就是这样。

Obviously, in that case, your fear is deeply ingrained and your mind will probably never be able to move past it, period.

youdao