Getting out of the friend zone?

I guess we are kind of in the "friend" zone now, even though we made out and had sex last weekend. We have been broken up, and right now it doesn't work if we date, because it is long distance due to school. So we have decided that it's best to be friends right now, and maintain a general friendship. My question is, how do I get out of the friend zone? Or, better yet, how can I avoid letting myself get too far in to it?