Lately I have paid a lot of mind to this. It truly seems to be a theme with everyone I have discussed intimate and romantic relationships with. It has occurred in my own relationships as well, where I have realized in retrospect that I have tried to embody my partner's dual because I realize it's what they desire instead of me in my rawest, realest form.
It seems to me that the things that are experienced as lacking in relationships are often the qualities that duals could very effortlessly bring to the table, and the dual is always subconsciously projected onto the romantic partner. And then, when the non-dual partner inevitably fails to embody the dual, there is a puzzling feeling of disappointment and lack.
Maybe it's a very obvious thing, considering it's what the theory suggests. I myself have very limited social circles and thus my data is also based on only a handful of individuals. You people who sail away in your mighty boats on life's social currents, do you frequently perceive this phenomenon? Basically I am curious about how this all manifests in real life.