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?


Dee and Charlie bang.
Mac bangs Dee and Dennis’ mom.
Frank bangs Charlie’s mom (a lot).
Frank, Charlie, and Dennis all bang the waitress.
Dennis tries to bang Mac’s mom.
Frank and Mac both try to bang Dee and Dennis’ Aunt Donna.
I think Frank bangs Dee and Dennis’ cousin Gail the Snail
But all of these are one off bits rather than being part of a larger arc or plotline, so I think it still fits the spirit of the question.
Well that and the question was about “between the group”, i.e. intra-group entanglements. The only one that’s intra-group here is the first (to which what you said about a one-off applies).
Mac and the waitress do hand stuff.