Life, it is when the kids doubt the absent parent's love that you have to tell them and reassure them that he really loves them very much, but he isn't able to show it at the moment. Be honest and real. But it is the most awful thing for a child to ever doubt that they are loved by their parents. So how you handle this is crucial for them.

Because we are in our right minds we cannot imagine walking away like that, but we are not them.