The very qualities that attract your partner to you in the beginning -- your unusual, individual, even bohemian aesthetic, for example -- could end up becoming the wedge that drives you apart. You're just too different to make this last long-term, even if you wish you could commit to each other. You two are looking for very different things, and you, especially, are likely feel pressured and restricted by the relationship.
Is your partner just in this because they're trying to do what they think they're supposed to -- what their parents want them to do, for example? Some people get married and have children more because they think that's what's expected of them than because it's really what they want to do, deep down in their hearts. Your partner could easily fall into this trap, and might push toward that end despite the fact that the two of you don't match up well enough to merit a long-term bond. You definitely struggle against these bonds of expectation and traditionalism. You feel like you're going to suffocate under all that control, those rigid parameters of what a love relationship is supposed to be or lead to -- and you buck the pressure in the only way you know how. If the relationship means something to both of you, you could develop a pattern of frequent breakups punctuated by brief reconciliations, but you always cycle back around to the fact that you just don't work out that well together.