I hate on-again, off-again romances... Worf 'n' Troi
Worf and Troi weren't really off again/on again. They started dating, and then the show ended and he got transferred to DS9.
Well, but you can't get more "off" than that, right?
I know what you mean, and you're probably right, but the way they just pretended, once it was no longer convenient, that that relationship never happened just irks me no end. I mean, please. Trek PTB: We can remember from one season to the next who was having a romance with who, OK?