Yeah, the art is similar 'cause cj michalsk is the artist. Is a collaboration between Cj milchask and Koyama Yukari. The story belongs to Koyama Yukari, and art to Ck Milchask, which the real name is Kusabe Eliza.
Funny thing that a yaoi's artist, actually draws a Josei, hetero, story. Yeah, I know it happens a lot, and sometimes in reverse, but I can't help, but think about to some of her works. XD and... Oh, please, God forgive me, but... It's like watching a version male of Azu, and a gay Junpei. XD Sorry, sorry. But, I like this story, anyway.
http://www.mangago.zone/home/photo/995780/
Yeah...lol... Ive found out soon enough after i wrote my comment up there...i read it in mangaupdates....(⌒▽⌒)... Im imagining it too as yaoi
XD But the story with her art is not so bad. I like so far, even though I hate that Rina chick! And, I want to tell you, I agree with some of yours osservation about Rina's husband. I mean, I don't think he has always been an asshole. Like you said, we don't know his backstory, maybe Rina is partly cause of his lack of confidence. I mean, Rina's cute and popular with men, so why she choose him? I think he has always wondered why. Maybe he has always been insecure about himself, and maybe has always considered Rina of his league. You know, it happens, although it should not, that in a relationship you feel to be not good enough for your partner, so you are always anxious, you feel insecure and you constantly ask when that person will leave you for someone better than you. And I think that's what happened to him.
(￣∇￣")Ermm.... Sorry its out of place comment but the drawn characters has some similarities with cj michalski's art...hahaha...and im not talkin about the plot/story, its just the art thing..anyway many artworks were kinda similar.
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Back to the manga---
I think the most pitiful one here was Rina's husband, it was not because he was cheated on but rather finding happiness for him is hard due to his personality. He's bitter, always distrustful and a really pessimistic person.Its really hard living like that. People like him are having a hard time dealing with their partners.. Even if they find a new one its hard for them to establish a good relationship, sooner or later they will end up in the same bitter cycle.. Its pitiful because happiness is something they couldn't grasp easily And also personality is not something you can change overnight.
And also I cant judge him why's he like that because we dont know his back story or what happened to him during his life before. He might be a victim of circumstances too. We only know him now as an adult.
And he might be awful but also possess some good qualities in him, one thing was that; he was a strong man ...Just imagine you caught your wife/husband having sex other than you and yet you still easily accept her/him. Man, it takes a lot of courage to do that.
Another thing was even though he self proclaimed he was the only good one among the three of them who cheated, still theres a truth in his words because he didnt also cheat on his wife despite the fact that he caught her twice cheating or having sex. He didnt go out and tried to find other woman to sleep with out of desperation... He's redeemable. He just need self assessment and then improve his personality.