You have some positives in your sitch. It is never too late!
1. Your H has said there is a chance you might get back together. 2. You see each other most days, therefore you have more chances than many of us, to show yourself in a positive light. 3. It doesn't appear that you have done any 180s yet...change something that blows his stereotype of you out of the water. One big 180 would be to put an instant stop to the "6 months of nagging". 4. You are still talking and are not at each other's throats.
Spend a few days reading posts in this forum. You will see that your sitch is far from unique, and you can get a lot of advice and support from folks who are further down the path than you, about what has worked and what has not worked.
Good luck, your new journey begins today!
Me: 54 Her: 50 and sexy as hell M: 32yrs T: 34yrs Bomb: Sept 26-07 "lost our emotional connection" Bomb 2: Dec 25-07 she's "not feeling desire" She asked if she could come home Apr 26-08! Everything's GREAT!