Another thought, maybe after waiting a while to give him time to think you could tell your husband that poly's still been on your mind, and ask him if he would be willing to just do a little reading about it so that he can know more about what it's actually about. Check out the Golden Nuggets section of the boards and visit www.xeromag.com
in particular for some excellent essays that *might* help him understand that poly doesn't have to be a threat to your marriage.
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.