Wow, has been a while since ive read such a messy story.
Pretending to cheat was the only solution and in such a shocking way like that, really? Discovering something like that the way it went can deeply change someone and hurt like hell.
Also, Fuyu mother speech skill is probably over 100% to be able to convince her to do such a stupid thing.
But the fact Fuyu is actually married and has a kid but the author made seem like she doesnt give a crap about them is yet the worst. Like, both main characters have a very dislikable personality.
I might just drop this, mostly because its dealing with very serious topics but in such childish demeanor that i cant expect nothing good or convincing from the story.