I feel you, lady. I've had a bunch of lovers since my gf and I got together (though not in the last year and a half, aside from my bf), and now that she finally has someone new in her life I'm constantly having to beat back feelings of "But why don't you love me anymore???" and I feel dumb about it. It's a natural human thing, I think. Ask for reassurance from your partners, take care of yourself, and find productive things to focus on. Only time will show you whether or not you ever had anything to worry about, but from here it seems like you're very well loved and like things really will be ok.
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.