那件事已经过去了，我不想再谈。

Nà jiàn shì yǐjīng guòqù le, wǒ bù xiǎng zài tán.

That is in the past, I don't want to talk about it.

不要再想过去的事情了。

Búyào zài xiǎng guòqù de shìqing le.

Don't keep thinking about the past.

别想太多过去的事情。

Bié xiǎng tài duō guòqù de shìqing.

Don't think too much about past things.