After last night, i have no doubts about the state of the couple. Even though they've been separated for two years it's like nothing ever happened. Leora and Paul reunited (were they ever REALLY separated?) because they both wanted it, if Leora wanted someone else in her life she wouldn't have been planning a whole year on how to get Paul and Eva to come to Prague. She would go on with her life with LB probably, maybe with yet another man. Ditto for Paul, if he didn't want to go back to Leora he would have continued his life with another woman.
Whatever happened in the past is in the past now. And probably Leora and Paul have already figured out their past mistakes. Anyway, now Leora and Paul will have plenty of time to be together and we'll see how it goes.