Bringing A Girl Into A "Friends With Benefits" Zone

Im in a little predicament.

So I've been seeing this girl that I actually like for a while now. We have traveled together and done that whole shebang. But the problem is I live in NY and she's in Miami. I'd definitely be in a relationship with her right now if she were in my vicinity, but I can't see myself being in a long distance relationship and I told her that already and she agreed. But there is something inside of me telling me she isn't fond with the idea of me fucking other girls. 

I wanted some of your suggestions on how I can go about talking about, and maintaining the "relationship" we have now until one of us moves closer to the other. Cause she is most likely moving to NY for school.