Yeah, he deserves to know that.对，他应该有知情权

deserve的用法:

1、deserve后常跟不定式，也可跟表示被动意义的名词。

He deserves to succeed.

The old man deserves looking after.

2、deserve后可跟名词，但中间不加介词of。

He has done nothing to deserve death.

他没做过该受死刑的事。

I need some time to sort this all out.还需要更多时间解决所有问题

sort out:整理；解决

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

我花了好长时间才理清了思路。

If he figures out that I'm lying to him--如果他发现我在骗他...

figure out:想出

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

我琢磨不透他为什么要辞掉工作。

lie to:对 ... 撒谎

It will be against my principle to lie to you.

对你说假话是违背我的行为准则的。