Although it seems we've (M+F couple) been "poly" almost forever, when you frame the question in relation to additional loves it get's a bit complex.
Although we aren't currently in a close (physically) relationship we have several past relationships that separated us by distance and circumstances.
We are still in frequent contact and were circumstances different would likely be back in that close intimate relationship we once were.
But life and it's demands are what they are sometimes and we don't grieve the past but prefer to celebrate all of what made those times & connections special. And what we all learned.
We are past hardly understanding any other way to live !