<human>: Can you summarize the given text in a few sentences?

Hey everyone,
I am at a crossroads at what to do with my current "relationship" Me and this girl got involved with each other about half a year ago as friends with benefits, with the understanding that we would see other people. We stopped and started again our relationship a couple of times, with as of a month and a half ago, more or less became exclusive.

Some complications:

1) We are both at the same undergrad. I am a graduating senior, with plans to do post-graduate education in a different city (2 hours from where we are now). She is a freshman.

2) Her best friend is a guy. They have slept together previously multiple times, and she and his family are very close. Though they are not "together" and aren't engaged in a physical relationship currently (according to her), they are very close to each other, spend a lot of time with each other, and for all intents and purposes, both of their families think they are perfect together.

3) We are very attracted to each other, and she says that I am everything that she wants in a guy. However, she is reluctant to enter an official relationship with me because she does not want to disappoint her best friend, his family, and her family.

4) With school ending and me graduating, I will be going home for the summer. Then, in the fall, we will be at separate institutions, although I can commute every few weeks. In the spring she is going for a study abroad in South America, so we won't even have the opportunity to see each other for six months.

Considering all this, I know that it would be very difficult to continue on. As much as I like her and want to be with her, her relationship with her best friend, her hesitation to commit, and the LDR situation are all telling me that this isn't a viable path to pursue. So my question is, do I break it off now immediately after I graduate and never contact her again, or should I just do a gradual fade out over the summer, and then kill it in the fall? What should I say to her in either situation?
<bot>: Me and my current girl like each other a lot and want to continue. Distance and other complications are problematic. Ditch her completely forever, or fade away? Don't know what to say to her...