I agree that friendship after D does muck up one's head, both H and I don't have the stamina to be 'just friends' - he even got other people to pick up dd because he couldn't face me and my opinion was, I couldn't get closure on the M if he was in my life at all. So I cut him out altogether and that is why we are dating. He missed me and came back into my life.
If it didn't work I would have to go dark on him for my sanity (I think it will work, though).
I feel, though, if you are hoping for reconciliation, no matter how small that hope, you have to be *just friends* for now, as that is the only way you will develop an R, through friendship.