Apologise, don't explain or rationalise, it reduces the apology.
Ask to be forgiven immediately you meet as in "there is something I need to ask your forgiveness for......", accept forgiveness with grace.
Say thank you, I knew you would understand, your friendship is very important to me.
Then BAU.
As for W feel the pain, don't suppress, observe it. It's just feelings they will pass. Sadness is one very important feeling.
D is angry, it's good that she is angry and showing it. Whilst not interfering then the alternative is some good quality dad and D time may be called for. Is there a joint activity you could do with D? Just you and D?
Just validate Ds feelings if she tells you her story, she is entitled to them.
My thoughts U.
V
Freedom is just another word for nothing left to loose. V 64, WAW