I feel like you and I have a very similar situation. My husband has taken a 6 month break however. We talk about the possibility of reconciling but he doesn't believe that I am able to be as sexual as he needs/wants. He doesn't think I have it in me. I tried to explain that if he does things that make me feel special, sexy, desirable, he will see a much different result but he feels it's something he shouldn't have to work for. Do you think it's possible to get the spark back or is that a pipe dream?
My husband has those doubts as well. He's been discouraged that some of the physical signs of arousal that were present in April and May have faded. He's worried that without those I will return to my previous behavior, and he doesn't want to live in that marriage anymore.
In my case, though, I can't point to anything my husband should be doing that he isn't. It will take time for me to prove to him that I have made a lasting change.
Have you considered sex counseling? It's expensive, and I wasn't able to talk my H into it, but it's cheaper than divorce.
I'm playing around with some dietary changes (reducing coffee and wine, for starters), but it's too early to tell if that will make any difference.
Me: 44 H: 44 Kids: 20, 16, 16, and 10 Together/Married: 22 years H announced he was emotionally detached and considering D: 4/4/16 H announced he is going to try to stay and reconnect: 5/1/16