Tremor

at first, I thought this was Netorare, I couldn't exactly tell who was saying what on the first page. Take that you Cheating man-whore

Well...I guess you can call it even since her husband is also a cheater?
In fact, I'd almost say she's better off with our protagonist. He seems like he'd respect and love her better than her husband.
That ending though. I found what he said to be kind of...ironic. Almost as if he's trying to get his buddy to take his wife or something...Well, he already did, though.

Translated dialogue seems to convey the suggestion that 'Husbando-kun' deserves what he's getting for openly cheating on his wife. At the same time, he's portrayed as ignorant of the fact that his co-worker and friend who carries his drunk-as-skunk ass home (perhaps most of the time) is (*cough-cough*) giving Chisa-san the satisfaction she should instead be getting from her husband. And by the end, it seems she's gotten over the supposed moral dilemma of being faithful to her marriage, if her husband is not.

For all we know, it may be another case of "Art Imitating Life", where "... the names have been changed to protect the innocent".

Not sure if the friend is giving terrible advice or great advice to the dude that's fucking his wife