Find someone to look after your D. Surely, there's someone, even if you have to pay them. Can you drop her at a playgroup or something? DB'ing is all about solution oriented thinking...
The reason I say this is simple if you take a look from his viewpoint, he's potentially thinking about building a bridge back to you and you put your D in the way.
How would you feel if it was the other way around, would you get annoyed? Probably not. Might you think she's not interested in getting back with me? Possibly. How would you feel if initially he said no and then said you've found a solution so the answer can be yes?
Enjoy your run. I get to about 5k and I'm pooped, but I can walk 100km in around 18 hours.
- Nobody has ever learnt anything important from happiness and success; problems make us grow - Consult your plan, not your feelings - If you haven't set goals, how can you expect to achieve anything?