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?
Though do you count that even though one of the characters is obsessed with his romantic entanglement outside of the group, to the point that I’d consider Mary a part of the group with how much she’s there. Iirc each of the other characters pairs up with someone, too.