Duì tā lái shuō jīngshénchūguǐ bǐ ròutǐ chūguǐ gèng yánzhòng.
For him, emotional cheating is more serious than physical cheating.
Tips
culture
Constantly debated on Chinese dating/relationship talk shows and 情感 (advice) blogs. Often contrasted with 肉体出轨 (physical cheating). Bar for what counts varies wildly.