I’m a person who is the unicorn in what was meant to be a triad. Things started out a bit how you described (no jealousy, no couples hierarchy, open communication). She changed all that, became jealous and insecure of me and stopped communicating, this is a person who has been in an open relationship with her partner for 10 years and something switched inside her and made her the green eyed monster she is today. My point is that peoples feelings do change and you can not deny that an established couple does have hierarchy (whether you believe it or not) and people in the Poly community have every right to scrutinise and judge unicorn hunters. Great that the arrangement has worked for you so fast but when things break down they break down fast and my experience has scarred me for life