Du Siheng had considered not telling Ye Xunhuan, but doing so entailed massive risks, risks he did not want to take.
It's important to understand that these risks weren't financial but rather related to his son's life.
Even though Du Siheng was furious with Du Jingcheng's current actions, it couldn't be denied that Du Jingcheng was still his son.
If things fell apart, he would have to face the grim fate of a parent burying their child.
Faced with Ye Xunhuan's intensely probing gaze, Du Siheng took a deep breath: "Young Master Ye, to be honest, I did think about not coming to tell you; I did think about letting them just kill you!"
At that moment, Du Siheng completely voiced his true thoughts. It wasn't his intention not to tell; rather, he understood there was no necessity to lie at such a time.
Nobody here is a fool; trying to fool someone will only lead to one's own loss.