Poly relationships?

Do they work? Some days I feel like I would be so mich happier with hubby and a gf or bf. It's probably just the hormones talking and the want for constant attention. Entertained the idea and hubby said gf is fine but where do I find another girl like that.....found a guy who would love to be in our little community and thinks the world of ua but hubby is being possessive and that's understandable.