I mean, I love Manbagi as well as anyone, but with the build up that TadaKomi has had until now, prior to Manbagi’s introduction, I’d be actually surprised if they aren’t endgame.
There will probably be some sad times ahead, but in a way that will make them grow as characters.
(Rereading this before the chapter where the three of them go bike riding together comes out. For some reason it feels like there’ll be some development in their relationship)