Originally Posted by Purpurea
So we are friends now, and so far it works "perfectly" as he has cheated on her with me a couple of times already
Then you're just engaged in bad monogamy--cheating isn't poly.
You'll need full knowledge and consent of all parties for it to be poly.
When speaking of various forms of non-monogamy...it ain't poly if you're just fucking around.
While polyamory, open relationships, and swinging are all distinctly different approaches to non-monogamy, they are not mutually exlusive. Folks can, and some do, engage in more than one of them at a time--and it's all good.