Maybe you can start by communicating with him. Just start talking about how you feel: about him, about his lack of interest in communicating with you, about life in general, about finances, about the kids, about yourself, on and on. Maybe if you use the language of feelings - of communication - he will learn from it and want to join in.

Otherwise, when I try my best to communicate my feelings to people and they don't respond in some kind of reasonable way, I feel that they just do not care enough about our relationship. Then it's up to me to decide what to do about that.