Was just watching the Seinfeld episode called “The Deal”, where Jerry and Elaine decide to start sleeping together while remaining friends, which of course lasts about three days. Interestingly, however, at the end of the ep, they decide to become a serious couple and Jerry even admits that this “might be it” for him. Yet, by the next episode, “The Baby Shower” (George confronts a bad date, Kramer gets mixed up with Russian cable guys), this second-go-round for Jerry and Elaine is never mentioned again. (And, if you’re wondering, the episode where Jerry explains to his mom and fake dad why he and Elaine broke up, “The Stakeout”, takes place before this one.)
So what did happen? This may be the biggest unsolved mystery in the Seinfeld lore.
(Hey, there isn’t much else to think about with all these repeats.)