i personally think that them being together right now is for the best,
Mafuyu is moving on and i think he doesnt love Yuki anymore, he do miss him but he's more scared than anything, if he is often thinking about Yuki it's not because he still love him, he is scared that thing will turn on the same with Ueno, if you are looking carefuly Mafuyu only think about bad memories, like the time when he was left alone or he argument he had with Yuki before he die, he didnt think about happhy memories and i think that Ueno is important cause he his the only ine who can prove him that their relationship isn't going to end like his previous one
I personally think this way but i think they will take a break for a moment
I know a lot of people have said it already but I reaaaally think that Mafuyu shouldn't be in a relationship rn, considering he clearly isn't over Yuki and he doesn't realize how it's making Ueno feel. Right now, I feel so bad him because he's competing against a dead person. And so far, he's been losing because Yuki was just that important to everyone. I just think Mafuyu needs to take a step back (maybe the two need to take a short break or something) and focus on healing himself before getting into a relationship.