Dear BF, Barb has all the right things to say, as usual, and so do all the other posters. I firmly believe that you were meant to enter Doug's life for a reason; I'm also glad he has softened enough to be able to let you in.
As the others have said, too, you've got to take care of yourself - keep your strength up, and try your hardest not to get too emotionally caught up in the situation, this for both of you, will be a good idea.
Best wishes, stay strong, and know that we are all behind you
Jacquie