Originally posted by: BeingBlunt
Basically there is a curse kind of that People of Mithila never marry their daughter to Ayodhya. After searching found that it was in Old OG Ramayan too but don't remember in anyone else. Srimad Ramayan also showed it. I think Mandvi's mother said something in the line of we understood everything you are doing but We should write in every house of Mithila to never marry their daughters in Ayodhya.
2nd part wasn't shown anywhere but I read this while searching for first part. Ayodhya People believed that you should not marry your daughters to a place whose daughters married into your City.