I’d like to know the chances of Sakura and Yuma breaking up (honestly, I want them to break up).
This is really hard to say especially because of the time skips. Their on-panel interactions that we are shown in the recent chapters are not exactly full on positives, and not a lot suggests that in the months that have passed has love really developed between the two of them (yes love takes time to grow). So it would be strange for them to reconcile in the ending, but many things will be odd in this final chapter.
Still, I think it's a comfortable 50/50, which feels like a bit of a cop-out prediction. The conversation between blonde and fucboi is a double edge where it shows that their relationship has become further strained and fucboi admits he might've skipped a few steps (great deduction sherlock) and they're now hurting because of it. It's at this point that blonde towards the end while not exactly telling him he NEEDS to change for Sakura, she does leave him some parting advice which can help him as the conversation cuts there.
The big question is will fucboi be granted some last minute character development for the finale as the hated side character he is atp, a normal writer's logic would probably be a no, but Airi logic is pandoras box. Another thing worth noting is that in this conversation fucboi and blonde and also relenting that they can't control/influence Sakura as much they have been after her chat with Mio helped her find her "core" as an actress. Even if fucboi is willing to change, it also will need Sakura to accept from her end (which might be a simple order with some more bad writing). In 134 though it really looks like fucboi annoyed her, and in the 1-month time skip in 135 something off screen might've happened to make fucboi reply with "I wonder..." when blonde asks if they're getting along.
If you want my biased answer, 100% they will break up for suuure.