I wasn't expecting him to be doing an affair, however in the first place I did not expect anything good about him. Just looking at him makes me cringe. I expected the negative part in him to go a completely different direction. She, of all people needs a break from the type of mess that happened in her life. Thankfully, she was able to avoid the worst of it.
When she first starting showing her face as a character I didn't really like her, but my opinion kind of changed when they explained her backstory, and now the fact that she's actually trying to be a proper parent is definitely the right direction for her. She still has her gloominess though. After knowing her like that for so long it feels unnatural for her to not be pissed all the time. I can't picture her ever to be near the level of any of the other characters but she's definitely made an improvement.
Still a few things this manga needs to get it going completely smoothly, but it's getting there.
I wish I got to see his ass kicked by her, but unfortunately this isn't the type of mango that shows that stuff.