Over the past couple of months, my wife and I have been having lots of drama because she's polyamorous, but I'm innately monogamous (at least thus far).
She has a boyfriend now and it's been a struggle, but I've finally accepted/realized that there's no actual threat of her leaving (which was the core source of my anxiety and jealousy).
So we're doing awesome now! We still have sex, snuggle, and generally carry on as normal, just that she also has someone who is satisfying that need to experience new relationships.