It will be important for you two, as a couple, to determine how your relationship will be structured, completely apart from anyone else's expectations or 'rules.' The good news is, all you'll need to do is focus on your natural, innate partnership needs for a clue to making your relationship as unique as it deserves to be. Of course, this emphasis on freedom and uniqueness could go overboard at times. There may be a distinct element of surprise and uncertainty to your connection, even if you make a solid commitment to one another.
Maybe you'll break up and get back together repeatedly; maybe you'll stay together but have a roller coaster of a connection in a more emotional sense. The point is, all you can expect here is the unexpected. At least whatever form this unpredictability takes, you'll know it's right for the two of you, in the sense that it could only work for you two and no one else. It might become tiring, of course, not being able to rely on your relationship, but what it lacks in stability, it will make up in excitement.