Romantic-Comedic television shows exaggerate what people experience in their lives. In the case of "You're The Worst", the show exaggerates the selfishness and what Maslow described as Deficiency-Love common in many relationships. However, just because it is "normal" (meaning the majority do it) doesn't mean you have to settle for it.
There are a number of reasons people profess wanting enlightenment yet don't follow through, fall short, or deviate from the path. The easy answer is that it is hard. But what makes it hard? What makes it so attractive to remain unconscious?