When we first separated (after my calling him out for abuse) STBXH made a lot of noise about not being able to see the DC every day, lots of crying and distress.
However, he has moved a long way away, and despite promising that he would move back closer it isn't happening, and the DC are really missing him
. It's part of the reason our marriage hasn't worked, because he can never not put himself first, but I really didn't expect this low level of interest.
A friend has suggested that maybe he's trying to force my hand to get back together, as he knows the DC's welfare is a huge priority for me...I can't believe he'd stoop that low but then I'm finding out a lot about him I hadn't realised 
I don't know whether to keep telling him how sad the DC are, or just to leave it...