Marriage is between 2 people and in case of Abhira and Armaan they both knew why they married each other and what feelings their partner have for them. They hid the truth of their marriage from 3rd party but both the bride and groom were fully aware.
But in case of Ruhi Rohit the groom himself was not aware that his bride was using him to get close to his own brother neither his family.
Logically after knowing truth poddars would hate Ruhi and punish her but as makers want most characters to support the 3rd angle they are not showing it.


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