My bf accepts my relationship with my gf and is chill about it but he definitely couldn't be said to feel compersion. And it's fine, I just don't share details or force him to think about the fact that we have a sexual relationship more than is necessary. Like, he's very aware that she and I are a thing and I'm not going to refrain from mentioning her if it's relevant, but I also don't bring her up just to sigh over how pretty she is in front of him.
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.