I wouldn't have let you slip away

我不会让你不告而别

slip away 逃走

例句：

The boys scuttled away when they saw the teacher.

那些男孩子看到老师时便仓皇逃走。

She grappled with her assailant but he got away.

她与袭击者扭打而他却逃走了。

And I'd say nice to meet you, 'stead of saying nice to know you

我会说很高兴见到你而不是很高兴了解你

Instead of prep.代替；而不是...

例句：

I made this cake specially, with brown sugar instead of white.

我特别地以红糖代替白糖做了这个蛋糕。

I gave him advice instead of money.

我给了他忠告，而不是钱。

The economy is shrinking instead of growing.

经济正在萎缩而不是在增长中。