Seinfeld- Jerry and Elaine are exes and breify get back together at the end of season one
Friends- lots of romantic entaglements but mainly Chandler/Monica, Ross/Rachel, and Joey/Rachel
How I Met Your Mother - two of the main characters are a steady couple, the other three are a love triangle
Big Bang Theory- by the end, it’s three couples and one single guy
Any shows like these where the main characters never date each other or hook up with each other?
E4 Humans, though that’s cause they’re all “siblings” (fully sapient sentient androids made all by the same creator, over multiple years)
Was gonna say Being Human, then I remembered that Russel Tovey does turn one of his girlfriends into a werewolf and she goes from side character to main character after that