ok, i just wanted to make this post to clear your minds of any drama, bad feelings and all that stuff.
first of all "together again" is most likely 80 years from the adventure time finale "come along with me". we get to see finn as an old man and that's the end of his natural life span asuming he lived 90 years or so. that means finn and jake are not reincarnating as shermy and beth right away. they have to complete at lest 7 or 8 lifes before that cause shermy and beth are born a thousand years in the future.
in "together again" princess bubblegum apparently left pep but in charge of the candy kingdom and is definitely living somewhere else with her inmortal vampire gf. again, its been only 80 years or so.
somehow, in adventure time 1000+, the crown ends up with bmo, wich means pep but has also concluded his life span and that's most likely the reason why pb created the giant prize gumball guard, to protect the candy kingdom while she's away living her life and there's no one else alive she can trust with that task.
we know that FOR SURE cause there's plenty of canon proof and hints that pb and marcy are still alive and well and most important together in that future lol
so yeah, stop being afraid and paranoid lol as the final obsidian song clearly states, these gays are gunna be together forever. the end.
