I think I've always known but I never knew it was an actual "thing" until quite recently, if that makes sense. I first found out about polyamory on a boring, rainy day when I was browsing Wikipedia and thought it sounded fascinating. I just had to know more. So ever since then I've been reading everything I can get my hands on trying to find out as much as I can.
Not to get too off topic, but what didn't you like about the ending of Harry Potter? I liked it a lot, although there were a few things I would have changed.