I will say, normally I don't enjoy misunderstandings between couples in stories. They often drag on far too long and I am left shouting "just talk to each other!" And usually when the MC is involved in this sort of isekai situation I want them to realize they changed the plot already. However, I've yet to hit that point with this story, for although I do want them to get together, I also understand why the MC doesn't see it. It's not just a matter of different love interests, they're going from one sexual preference to another and as far as he is aware, from reading the book, the other guy was straight with two female love interests. Hopefully though as he starts to realize the other relationships that have happened MC's mind will open up to the fact that in this world, people are much more open about loving who they want and there is no pre determined sexual preference.