at least that's what my ex-husband used to tell me. Ironically when I was with him i wanted an "open marriage'' (I hadn't heard about polyamory.)
We split, I fell head over heels for Z; suddenly had no desire for anyone else and wanted him all to myself. Unfortunately I'd already told Z that monogamy was no big deal for me.
So, even though I have this kind of weird sensation that I am living out my own karma, I have this deep knowing that polyamory is right for a lot of people, maybe even me, if I had the time.