By the end of her life Clara wanted to be more heroic, like her hero, the Doctor. All Me ever wanted to do was get off of Earth and see the galaxy. But both were denied in their efforts. Eventually fate led them to steal a TARDIS of their own to have their own adventures through time and space.
Some could say that fate kept them apart. Regardless, it wasn't any fault of their own. Until the time is right to return Clara to Gallifrey (which feels like eternity), Clara and Me will keep creating their own happily ever afters.