当朋友告诉我因事不能来赴约时,我应该用英文怎么说?

原谅可以说
It doesn't matter.
Never mind.
That's fine/Ok.
责怪呢可以说：
You should not do like this.
Please do not let this happen again.

Not at all

ok,that's all right .(It's ok )
或者，你可以邀请他/她下次再聚咯。。

That's OK. Let's make it next time.
没关系，下次吧。