coupledom

plural coupledoms

1. uncountableusuallyThe world or sphere of romantic couples.

   The ads were already showing as he clambered along and in their patchy glare he loomed and ducked and apologized, and was a clumsy intruder in a world of snuggling coupledom.

   2004, Alan Hollinghurst, chapter 6, in The Line of Beauty […], London: Picador, →ISBN

2. uncountableusuallyThe state of being a romantic couple.

   More coffee is consumed, a movie date is arranged, coupledom achieved and, naturally, nuptials performed.

   2011 February 13, James MacGowan, “Heart of the City by Ariel Sabar”, in Toronto Star

   2 more examples

   Don't post a picture with a guy who isn't your boyfriend, or people will think it's an announcement of coupledom.

   2018, Katherine Reynolds Lewis, The Good News About Bad Behavior: Why Kids Are Less Disciplined Than Ever — And What to Do About It, page 18

   Their hard-won, second-chance coupledom had never been to me more gently touching, every bit as much a symbol of 21st-century Britain as the sound of a gospel choir, or a Hindu prime minister reading from the Epistle to the Colossians.

   2023, May 6, Rachel Cooke, “It was ludicrous but also magnificent: the coronation stirred every emotion”, in The Guardian