Hi, Grace ~ I'll wishy-washily agree with everyone, except I would skip the part about how his lack of response hurts you. At certain points in the separation process, I think it's impossible for the WAS to hear any expression of those kinds of feelings from their spouse without it feeling like pressure, setting off guilt they don't don't want to deal with, etc.
You have every right to point out that his behaviour is impacting your parenting relationship, though, and to ask him to 'step up' when it comes to raising your children together.