If you had a crush that belonged in the same tree as their crush, you are told to break up because my law it is forbidden so therefore now you're lonely and your siblings are dancing with their new crushes. You have to suffer through their wedding. And instead of actually getting married, you have to pretend to get married. After that, instead of taking care of a real baby, you have to take care of a toy. While your siblings take care of a real baby and the baby takes your place as the best on top of all that mess.
In this story, Belle tells Freddy that he has to break up with who he knew his whole life. Her name is Star. And Star, her sibling, had a wedding with a family member of Freddy's sibling so therefore everything ties in as a big break up. So they feel so angry and blame each other for having siblings who share a tree by fault. Freddy and Star had to break up because their older siblings got married. And not only that, but they had to suffer being an aunt and uncle. And when they used to be the favorites, they became the second favorite. And everything they did was not cute, but everything the younger ones did was cute. So they really hated the weddings.