Yeah, he deserves to know that.對，他應該有知情權

deserve的用法:

1、deserve后常跟不定式，也可跟表示被動意義的名詞。

He deserves to succeed.

The old man deserves looking after.

2、deserve后可跟名詞，但中間不加介詞of。

He has done nothing to deserve death.

他沒做過該受死刑的事。

I need some time to sort this all out.還需要更多時間解決所有問題

sort out:整理；解決

It took me quite a while to sort out my thoughts.

我花了好長時間才理清了思路。

If he figures out that I'm lying to him--如果他發現我在騙他...

figure out:想出

I can't figure out why he quit his job.

我琢磨不透他為什么要辭掉工作。

lie to:對 ... 撒謊

It will be against my principle to lie to you.

對你說假話是違背我的行為準則的。