Just like in the original novel, Ding Juesi was indeed having a mental affair with Wen Jingping, especially since Wen Jingping was actually still single, unlike in the original novel, where she had already gotten together with Huo Shaofeng.
This gave Ding Juesi a good reason to pursue "true love", and his attitude toward Wen Jingping was much warmer than in the original novel.
However, Wen Jingping only wanted to make use of Ding Juesi from the beginning to the end. How could she really have a substantive relationship with him?
Every time Ding Juesi hinted at her, Wen Jingping would try her best to decline, but she would not hurt Ding Juesi's self-esteem. She would keep him at arm's length.
Ding Juesi would mistakenly think that she was avoiding suspicion and keeping a distance from him because she was concerned about his status as a married man.