How is the sanctity of marriage bond portrayed throughout the narrative?

From what I can tell, women carry much more of the burden in marriage than men do. From the beginning of the narrative you can tell men have a much more relaxed role in the relationship, as the king, Dasharatha, had multiple wives. Moreover, he had children with all of these wives, while they all had to remain faithful to him. Where the roles in marriage really caught my attention, however, when Rama said in Ayodhya 19-20, “I will gladly give away… Sita (his wife)… [for] my father’s command.” This may have been meant to display his loyalty for his father, but it reveals something more about the way marriages were set up in his time. Furthermore, he goes on in Ayodhya 24-25 to say to his mother, “… this is the eternal religion. To a woman her husband is verily god himself… if she does not serve her husband, [she] is deemed to be a sinner.” This paints a clear picture of how women had to respect the binding of marriage to their husbands, while the husbands enjoyed the comfort of whomever they pleased.