Since he decided to admit his mistake, he had to level with Yan Zheke about this incident. Otherwise, she would be confused by his sudden apology.
Also, Lou Cheng honestly did not know what kind of reaction Yan Zheke would have after she learned of the situation. For a moment, Lou Cheng was quite hesitant, but after repeated consideration, he finally decided to come clean.
If Yan Zheke's family was well-connected in the local police department, there was a big chance that she would hear about what happened from other sources. By that time, the consequence of keeping such a big secret from her was more serious than him getting into this mess recklessly.
According to Cai Zongming, no one wanted to either be deceived by others or have the truth hidden from them. Men were this way, but women even more so!
Lou Cheng weighed the words and eased his worries over what he had done before the confession, then he sent a message without using any emojis.