The moral for me: Don't make assumptions about other people's relationships, just ask. Especially not after a year and a freaking half. If I'd just sent an email saying "Hey Harry, Davis and I broke up. I'm not sure what I want at this point, and of course things may well have changed for you. What agreements do you and Violet have?" everything would have been fine. Of course, his lie probably still would have come to light and things probably still would have exploded, so it actually wouldn't have been fine but at least I would've felt less foolish on my end.
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.