This is a good question and one that I'm not sure enough people ask themselves!
How did you feel about your husband when you first became poly? How long have you been poly... a year, did you say? Have you ever experienced dips and peaks in your feelings for him before? How long have you been feeling this way?
Like SN. said... do you still have dates at all? Do you still make time for intimacy and romance? Or has this faded for you; do you no longer want to?
Have you ever read Sternberg's Love Theory? This concept helps me massively when I am trying to figure out what kind of love, if any, I feel for someone. It might help you to recognise what you're feeling for your husband and whether or not there might be a road back, if you want to take it - http://en.wikipedia.org/wiki/Triangular_theory_of_love