Clifford didn't ask Zhen-Zhen further. With her answer moments ago he already knew that her feelings for Tristan were sincere. It's not easy to change her heart.
Wooing women was not his expertise, unlike Tristan who knew how to make women fall for him easily. That's what he did to Olive. He was able to seduce Olive easily though she and Clifford were in love with each other. That's what Clifford was thinking.
Meanwhile, Zhen-Zhen just continued cooking pasta, oblivious of the scheme Clifford was plotting against her and Tristan. She was so kind and generous towards others that she even failed to notice the bad intentions people were trying to do against her.
She was sealed for one hundred years without experiencing the real world. Aside from guardian warriors who were trying to kill her, Zhen-Zhen had to learn that people in this other world were also dangerous.
