?? This is a poly anthology, if you don't wanna see poly relationships then don't read it. They literally said so many times that all of them are in a relationship, there is no two-timing here. Poly relationships can work in different ways, this is just one of them.
Kinda funny how all the translators still missed chapter 3, makes me curious if they do it intentionally or not.
Edit: I just checked and the two untranslated chapters don’t have GL endings, might be the reason why. Not really disappointed that it’s untranslated now, I came here for the yuri...