Any of the classics

They had, hands down, the most problematic relationship of all couples. The Beast was not just a "bad boy", he was a full-fledged villain, in relation to Belle and her father (he allowed the idea of ​​starving Belle with hunger only because she refused to have dinner with him). And I never thought that the anger issues of the Beast are somehow connected with his curse (after all, he began to become cute to Belle long before the fall of the curse). For me, this is the reason why he was cursed firstly , he was a selfish, cruel, spoiled man. And only the appearance in his life of Belle made him change (or he simply had no other choice, because otherwise he risked to remain a monster forever.). And I think if we are talking about real life, then the problem of violence in the family is not solved so simply by thanking the power of love. Therefore, as a real couple of Belle / Adam for me, more unstable than the rest couples. Of course, they had their sweet romantic moments in the film, but they do not seem to have much to heart talk. Such stories are good in fairy tales, but in real life such relationships rarely have a happy ending.

They are too different from each other, have too different priorities in life and have completely different outlook on life. They will barely last together.
Also, Adam and Belle for same reason.

Them, and also Belle and Adam. I fail to see why loving an abusive guy gets Belle so many followers.

Them and basicaly all the love at first sight couples. I don't understand how give up your talent,change yourself drastically, and leaving your family for a guy you know next to nothing about would guarantee your happily ever after with him.

Ariel x Eric and the Classics all had chemistry and their affection for each other was obvious.

These two hated each other half the movie and it only stopped for good when the Beast traded his library for her love (not that I really can blame him- I'd probably do the same if my other option was staying a monster forever). Changing yourself to please someone else is not only way more ubhealthy than falling for someone quickly like those other 4, but it's unfortunately all too common irl. And it's a poor foundation for a committed relationship.