By titling the show "Crazy Ex-Girlfriend" it focused on how Rebecca upended her life in pursuit of Josh. But, of course, the Josh pursuit, was a metaphor. (Sorry, Josh. You deserve love too!) Because what Rebecca, and anyone who watched the panic attack caused by success in her prior life, knew, was that her life back in New York had sucked. And yes, moving across the country to reconnect with your camp boyfriend is not a great choice. And it won't always work out. But it is very true, much like that are you emotionally stable enough to get bangs quiz, there are moments when you know something isn't working and you reach out to change something to make it better.
Regardless of how Rebecca's relationship with Josh did or didn't work out, her life got better in West Covina less because of Josh, but because Rebecca found community (and also, therapy, a diagnosis, and some medication). Early on it looked like they were quickly wrapping up the folks around Rebecca, much the way that shows often do to get some resolutions out of the way to clear space for the finale. But they weren't done. Heather and Hector got married and moved into their own place and figured out how to negotiate life as adults. Kind of. Valencia and Beth move to New York, but struggled with being ready for commitment on the same timeline. (Valencia's joy at realizing she could propose was a thing to behold.) Nathaniel decided to be nice, a thing he told many people, because that's exactly how that works. Paula passed the bar and sent her kid off to the non-Peace Corps thing. Greg figured out that West Covina and his dad's restaurant were actually kind of great, and a lot of his negativity had to do with his dad having been a drunk who mishandled the business. Darryl and white Josh figured out that they were leaning on each other for emotional support too much, and white Josh got back in the dating game and Darryl found April in the hospital waiting room.
There were further developments in finale episode, but in many ways, despite the decision that Rebecca revealed, the thing she really found by going after the wrong thing in the wrong ways, was a really great community. (Well, white Josh still isn't sold on her, but really who could blame him.)