在这里，"和你分离了很久" 可以用英文表达为 "It's been a long time since we were separated/ apart." 或 "It's been a while since we were separated/ apart."

这个表达的来源可能来自于人们经常用 "a long time" 或 "a while" 来表示一段较长的时间，例如 "It's been a long time since I saw you last."（我们最后一次见面已经很久了），"It's been a while since I went to the beach."（我去海滩已经有一段时间了）。

下面是一些关于 "It's been a long time since we were separated/ apart." 的英文例句以及其中文翻译：

"It's been a long time since we were separated."（我们分离已经很久了）
"It's been a while since we were apart."（我们分开已经有一段时间了）
"I can't bepeve it's been so long since we were last together."（我难以相信我们最后一次在一起已经这么久了）
"It feels pke it's been forever since we were last together."（感觉像是我们最后一次在一起已经很久了）