Nope, It have always this way. While the ship is clear though it is just one side. like how even other character acknowledged and thought they are dating and MC clearly fall for Nanako. Thing is realistically, keep it wholesome it should stay that way, MC is fine settle for friend since well, she already married. People just expect some sort of NTR where Nanako gonna cheat on the husband, that just so fucked up. Like i read worse porn and even i think that mess up, well, the more indecent it get the better the porn ¯\(ツ)/¯