>Can you think of one movie or TV show which models a realistically happy working adult marriage which isn't either sentimental and idealised, or doesn't end in drama, tragedy, and betrayal?

Sentimental and idealized are very vague, but there are a ton of US sitcoms that have this premise. But also, watching a couple just go about their day to day life that 90% of people go through seems boring as hell, who would watch that?