the problem is when the plot and the options are in contradiction.
Well this is a VN, but like in reality, long range relations have a big chance in failing, he is gone for 6 months, 6 months he can't satisfy a woman's needs, as well he has needs too, in those cases tempation, curiosity and friends seducing you to explore can be pretty dangerous. I never been in such relation but my bf did and it also did turn bad for him. So I think the plot for this game is pretty valid with those multiple paths to solve those problems, either the love is so strong they don't have desire for those needs to be fullfilled, a temporary open relation could be a resolve, but risk they could get feelings for the new partners, or worse of all the needs are so great they even rely on cheating and pretend nothing happened. In that sense i think a pretty well made VN as it give all those possibilities.