Okay. A lot of people have a theory that Jaune comes from a noble or possibly royal family. We all know that if your born into a noble or royal family than your parents are more than likely to set up an arraigned marriage for you.
I personally think the whole idea of arraigned marriages are stupid and wrong. No one has the right to tell you who you can and can't marry. Royal or not. Still, they do make good plots in stories.
Now, if Jaune was from a noble family and since he is the only male child, his parents would try to find a girl they think would make a good wife for him. They would need to find a girl who comes from a rich family, who is single, who is a strong fighter and is breathtakingly beautiful. Now, who do we know that fits all of these criteria?
I can think of only two girls. But, since Winter is too old, that leaves Weiss.
I know the odds of this are slim to none, but listen to this. Everyone discovers that Jaune comes from a very rich and noble family. After getting used to the idea and getting over the fact that Jaune didn't tell them, everyone still considers him a normal guy. After a few weeks, Jaunes parents or oldest sister (whoever's in charge), comes to Jaune and tells him about his arraigned marriage. Jaune is amazed by the fact that his family did this without his knowledge and he's even more amazed when he learns that his chosen wife is Weiss.
The same exact thing happens with Weiss. Her father or Winter tells her that her chosen husband is Jaune. She totally freaks out. Both Jaune and Weiss beg their families to break it off, but they say it's too late. Later, Weiss and Jaune have a private discussion about this whole thing. They both agree that while, they consider each other good friends, they don't want to get married. Both of them agree to keep this a secret and decide to work together to get the marriage annulled.
After a series and unfortunate and hilarious tries with the help of Ruby,Blake, Yang, Nora and Ren, the marriage in broken off, Weiss and Jaune agree to stay friends and Pyrrha and Neptune never hear a word of it.
Tell me what you think of this and feel free to throw in your ideas about Weiss and Jaune having and arraigned marriage. Throw in your own ideas about the story part of this too.