So maybe he is having a tough time trying to reconcile the guy he has become with the guy he used to be. I can imagine he must carry a lot of guilt around with him knowing what he is doing to your family and that is why he can't bring himself to spend time with S and seeing your ever growing bump must be tough.
This adds a whole new dimension to the situation because it puts into question if he really in his right mind to be making such huge decisions like D. Would the courts take this into account?
Me - 47 H - 45 D-16 M - 6 years Separated - May 16
Don't leave me behind can't you see me I'm shining... (Years & Years - 'Shine')