Yours is certainly the most unique situation I've seen in my time here. I feel that any interest from your husband would be a positive for you. In saying that, it's been a long time with little contact and you are doing a marvelous job of living your life. Have you ever just checked in with him outside of birthdays and holidays to see how he's doing? Not exactly DB but not speaking to each other for 2-3 months at a time isn't really working.
Me: 31, W: 29 T: 4 M: 2 Kids: 3 (SS: 7, SD: 4, D: 3) Separated, still living together: Nov 2013 Separate bedrooms: Feb 2014 W working away; kids with me: Nov 2014