Honestly, even with the cancellation, the author didn't need actually need to give any of them a boyfriend unless that was the intention the whole time. Unless that was also a (bizarrely specific and counterintuitive) form of editorial meddling, which... I guess it could be? If we're trying to absolve the author of everything we possibly can? I just think that, regardless of what the author was trying to do, if they hypothetically wanted to put middle fingers up and say "fuck you" to everyone who'd gotten invested in the story, a pretty effective way to do that would be to resolve none of the romance plots and then say that at least one of the girls is thinking about marrying a boy instead.
I'm just really glad I stopped caring about this story back in chapter 8. I kept an eye on it afterwards, kinda hoping that the plot would go somewhere and I'd get drawn back in, but... No chance of that anymore, I guess.