This relationship has a unique form and function for both of you. The emotional bond between you will be similar to that between a parent and child, or a teacher and student. This is not to say that your bond is platonic, and it's definitely not to say you're unequal!
You are equals -- it's just that there is also a natural potential for teaching, learning, expansion and growth in this relationship. From the start, you were on an emotional growth trajectory, going through all sorts of personal changes and enlightening life lessons, and your partner serves as audience and guide for this journey -- and perhaps even a mirror by which you gauge your progress. This dynamic could lead to trouble, however. Your partner is required to provide a lot of emotional support and sensitive feedback, and could end up feeling used or taken for granted -- or even resentful of the changes and soul-growth that the other partner undergoes. And you, who have been growing by leaps and bounds, could take on a sort of center-stage position in the relationship that could end up squeezing your partner out of the spotlight. You must both be aware of this potentiality and strive to be equals, even while supporting one another's growth as emotional beings.