Thanks Ciel, that was a really nice reply to get.
I've been browsing the forums since I posted this, and I'm really glad I found this place; I'm already learning more about how polyamory works for other people.
I guess one of the problems we faced was such a shallow understanding of polyamory. I don't actually think the three of us ever had a serious conversation about our relationship together. I did all the serious talking with Leslie, and with Gregor, and just kept the information flowing. That's probably something I did wrong, I should have initiated a rulebook forming conversation or something.
Oh well. Thanks again for your reply!