Stopped watching it years ago. Is the whole show still structured around the Ross and Rachel "on/off" relationship? Shit! I mean JD and Eliot. Dunno how I could've got those mixed up, they have NOTHING in common!
They ended that whole storyline in season three, though they sort of brushed up against it again at the beginning of season seven, more as a way of dealing with the current storylines than to actually start up that story again. It's never been structured around that relationship, though, so I don't know when you were watching.
And actually, the show has done a pretty good job of showing how much they do have in common. In season three they even go through a bunch of reasons that she's perfect "on paper" for him even though he doesn't love her. So again, I don't know when you were watching.