Lois is but one of MANY emotional ties to humanity. After becoming his wife she would climb to be nearing the top of importance if not at the top, but he certainly doesn't need her to retrain his humanity. The Kents instilled that in him when he was young, and he can hold onto that even when they are not around (probably why it's probably better to keep them dead once he reaches adulthood). He also has other friends besides her. Perry, Jimmy (both of whom totally know his secret as I'm sure he is aware on some level), Lana, Pete, the Legion, Kara, Krypto, Bruce and Diana are the major ones.

This trend of making Lois the only thing keeping him from becoming a psychotic alien tyrant needs to just eff off already. It creates an obnoxious perception of him. And it also makes her nothing more than a pacifying object for her man. No thank you.