Sell also: duty, obligation, province
• Noun: the social force that binds you to the courses of action demanded by that force; every opportunity, an obligation; every possession, a duty"- John D.Rockefeller Jr; examples: "we must instill a sense of duty in our children", "every right implies a responsibilit"
• Noun: the proper sphere or extent of your activities; example: "it was his province to take care of himself"
• Noun: a form of trustworthiness; the trait of being answerable to someone for something or being responsible for one's conduct; example: "he holds a position of great responsibility"
It's not someone else's responsibility to honor my marriage. It's my responsibility.