Well, you've never told us what that "something which happened in the past" is. I don't see how we can say whether or not it's a good idea to look past it if we don't know what it is.
Me, 30ish bi female, been doing solo poly for roughly 5 years. Gia, Clay, and Pike, my partners. Davis, ex/friend/"it's complicated." Eric, Gia's husband. Bee, Gia and Eric's toddler.