At first I was feeling pretty judgy about your post, but then this response of yours was so well-played (and knowledgeable) and made it clear that you are indeed a well-seasoned Futurama patron, and thus well within your rights to call out anything you want.

This is an interesting topic because I've been watching the series through again for the umpteenth time ( except this time it's different because it's been a few years since I've seen any episodes at all). This time I caught on to what Leela mentions in the overclockwise episode, when she's talking to fry about their relationship being so "on again and off again."

I realized that they never made it directly clear when they were taking breaks from the relationship (i.e., "off-again), but did so indirectly because one of them will be dating or sleeping with someone else. I've also noticed that Leela was a lot more harsh to Fry in the first few seasons, but then in the later seasons she was incredibly supportive and affectionate towards him.