I came across this bit of info recently and it's interesting that this was a thing. Staff members that worked on UAF being so dead set on the Ben/Julie relationship that they resort to this. Unsurprisingly, that little stunt didn't work, because of course it wouldn't. Of course, Cartoon Network wouldn't care.
Derrick J. Wyatt was right though. I get that Omniverse breaking up Ben and Julie was done poorly, but it really was for the best. The set up for their relationship was rushed and Ben and Julie's relationship really did have little to no chemistry. Julie was not interesting and engaging and Ben was a jerk and an idiot to her. It felt like an unnecessary relationship done just for the sake of having Ben be in a relationship. Julie's purpose was to be a satellite love interest to Ben and it's the UAF crew's fault for not making that relationship good and well-executed.
If people like the Ben/Julie relationship, more power to them. It still baffles me though that people willingly support it and were so up in arms over their break up. Ben and Julie breaking up really was for the better and if anything, it would've been better if Ben wasn't in a relationship in UAF to begin with.
Granted, it's not like Ben and Kai's relationship was any better though. That relationship had its own set of caveats that made it terrible as well. I certainly think that Derrick J. Wyatt and the Omniverse crew were in the wrong for pairing Kai up with Ben, handling their relationship quite poorly.
I already mentioned these videos before, but I again recommend checking out these videos by Sarcastic Chorus. They do an excellent, if not perfect, job of going in greater depth on why Ben's relationships with Julie and Kai didn't work.