He mentioned not recalling clearly what happened that day so it technically wasn’t a lie from his perspective.
He didn’t see any good coming out of confessing it might be due to the conversation he had with the Empress.
He’s obviously going through mood swings, this is a sensitive time of ovulation similar to pmsing for women.
He takes the crown prince reaction as rejection, like he doesn’t want to be with him, that’s why he was against taking sex classes together.
It’s a misunderstanding which is hopefully resolved.
First he caused a rift as he lied to the empress and then pretended he didn’t say a thing. Then he blames the prince for literally nothing. He decided not to go back home and stay at a safe place, but to a hotel.
And then acts b*tchy. Ew