Don't feel too bad SoL, it was a perfectly understandable question. People here, perhaps even moreso than on other forums, speak forthrightly, so our answers may have come off as judgmental, but I don't think most/any were intended that way. And, y'know, if percentages WERE available, I wouldn't be surprised if a fair number of people DID engage in mono relationships early on, then engage in poly relationships for a period of time, and then decide that mono worked better for them.
The major players. Me, 30ish bi female. Gia, girlfriend of 4+ years. Clay, boyfriend/dom. Davis, ex/friend/"it's complicated." Eddie, roommate & fwb.
The supporting cast. Eric, Gia's husband. Bee, Gia and Eric's toddler. Dexter, Gia's lover. Helen, Eric's lover. Izzy and Nikki, Clay's partners. Liam, Eddie's husband.