Why did Stella's husband Cui Yingjun cheat in a perfect relationship?

The income gap between husband and wife in the play is too big (in my opinion, if Cui Yingjun is really Estella, he should work harder for his career, realize the problem of being attached to his wife and holding his head in front of the manager as soon as possible, and it is best to find a way to get rid of the nepotism between stella and DL and work hard in the hotel, even a little). This gap is gradually enlarged, not to say how strong Stella was at first, but when Cui Yingjun saw the hotel, Risdela. One-third of Cui Yingjun's hotel business comes from DL, that is, in the first few episodes of Stella, Cui Yingjun grovelled at home to change Stella's shoes, cooked and washed clothes in Longjing, and then soaked in tea ... More behind, in my opinion, he has become a soft rice man attached to his wife.