Speaking up

What can I do when he shows little regard for his children. Too busy with ow and her children. One of his own children had a small accident requiring stitches. Informed him of incident and 2 hours later responds with text. He made no attempt to call or see him once he knew of incident. Waited until next day to see him. Made up a very lame excuse. I tried with all my strength to let it go but I felt I needed to speak up for the children and tell him that the children should always be a priority in his life. Did not take it very well. Feels like he has banished us all now. Somehow feel like its my fault for speaking my mind. I know it's not, but hard to fight those feelings. But even when we were together and I did start expressing my concerns I was given the cold shoulder. But why does he have to hurt his own kids?