You-chan in the most recent times become better. He tried his best to change but sadly he still can't really get hard for some reason when getting naked with his wife. He helped Michi with almost all the house chores so Michi who wanted to pursue her career to get a promotion after not really caring about sex anymore (Because the night they tried to have sex hurt You-chan and his pride a lot). He also apologized to his glasses co-worker and realized her feelings for You-chan and kind of helped her on easing her problems a little. Ironically, Niina got worse. Because his wife is trying everything to change and becoming a better wife, but Niina rejected all of her efforts. Even if it's her fault, she still kind of deserved a second chance but Niina won't give her and is still stuck with his feelings for Michi.
In the end, my take is You-chan is better than Niina as a husband in terms of keeping his feelings loyal to his wife. He just cares about himself and his wife. He WAS really selfish, but he started giving effort for Michi and just for Michi. Niina on the other hand, could not move on from Michi. Both "Cheated", but You-chan cheated on the body only, in where Niina cheated on his wife in feelings. Sure You-chan doesn't show much passion for his wife (yet), but it's there and it exists.