Maintaining a long distance relationship as an expat in France

Long distance is nearly impossible long term, you must have a point where you have discussed the time frame that you will be back or that they will move here. İ believe it is an obvious unsaid, that children of course change the scenario and there a plethora of other things.
      For basics, it will depend on your length of time here. If your time in France is quite short, then with the help of video calls, and phone time, it is possible. If it's longer than a few months, İ would say that certainly flying out to see each other is a must, over 2 months can put a severe strain on the both of you. Frequent visits every 1-2 months maximum will raise the relationships chance of survival.
      İ left my last relationship when I knew I was going to live in France. Not the only reason, but certainly the main one. We had a sit down discussion, spoke of many things and what we wanted in life, it was quite clear that they would never leave their state. Finally in the end, we wanted very different things. Perhaps this is another thing to consider. Hopefully if you are doing long distance, you have already sat down and had a serious heart to heart. 
      A bit of a Pandora's box. 
      Ultimately, it is up to you. İ know some couples that are quite happy to spend time apart and prefer to have space and often, and some that have been together many years and will never break up. It is all up to what do you want and what will work for you.
    Best of luck.