Peter and Olivia were almost together… and then it wasn’t really her.
Then, they were together… and William Bell took over her body.
Then, flashforward to the future and they are married… and Olivia dies.
Then, they save the world… and Peter is erased.
Then, Peter comes back… and Olivia doesn’t remember him.
Then, Olivia remembers him and it is beautiful… and then she is shot (but yay for cortexiphan because she comes back from the dead)
Then, Olivia is pregnant (yay everyone is happy)… and flashforward a few decades when the world is ending, no one is happy, their daughter was taken, they’re stuck in amber separately, and they’re divorced.
Then they start getting back together… and Peter becomes an observer.
but then they save the world, and they live happily ever after, though without Walter, which isn’t so happy after all. But they’re together.