I've seen lots of manga that was blatantly loathsome. I prefer that because I can take one glimpse at the synopsis and mark the series as "Dropped"
However this kind of manga is worse because it slowly sneaks in the horribleness causing any interest in the storyline or characters to suddenly blow away like a heap of ashes.
For those of you who read the comments to try to avoid certain things in the stories you read, there is both domestic abuse and cheating in this story, and the pressure seems to be building toward something messy and devastating. I give it a rating of 3 stars, because the art and presentation appears to be technically competent, even if the whole story is a trainwreck.