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?
Brian almost definitely slept with Marsha. As best as I remember from subtext and possibly the DVD extras, he was behind on rent, and Marsha made an indecent proposal. Add that to the fact that he’s hung like a horse and you understand why Marsha might retain some interest.
Also, Tim and Daisy do eventually get together, but officially only after the series ends. Tyres saw what was going on a lot sooner than that though.
Finally, there’s the potential that Mike might actually have more than a man-crush on Tim. They have a bromance, sure, but there might be other things going on in Mike’s head that Tim is completely oblivious to.