At first, your different values might not have been a problem. Your partner might even still be attracted to you for the very fact that you're so different from them, and you each have something to learn from the other. They are likely to be much more traditional than you are, and they're very enamored of this person in their life who throws caution and tradition to the wind; they wish they could do that more often!
You, the less traditional partner, look at them and admire that normalcy -- that steady, straightforward approach to life. But there's a reason that each of you is the way you are. If you try to have an overly traditional relationship because you think you should, it just doesn't work. Neither does doing things in a wacky, irreverent way, either. Basically, you both struggle with this relationship, and if you are trying to make it last long-term, you might have trouble making that happen. There just isn't enough of a foundation beneath your feet to make it possible. Your relationship constantly swings between the two extremes of traditional structure and unique expression, and after a while, the roller coaster ride could be too much for either of you to handle.