Does Your Ex Participate?

When I was going through my divorce, my ex was right there, ready, willing and able to participate in our daughter's life. After a little while, and he saw that we didn't have any hope of getting back together, he just all of a sudden, stopped his interest. His caring of how we were doing totally came to a hault. He no longer called ten times a day, begging to get back together. He stopped calling to see how our daughter was doing. He no longer had a desire to help be a parent. I was very hurt by this because I believe that together or not together that all children deserve to have both of their parents available to them at any time they need. Children are innocent in divorce and have no say about things until they reach a certain age. They don't get to choose if we stay together or move away. I was not happy when my ex chose not to keep in contact with our daughter. She needed him. She needed to hear that he still loved her, no matter what was going on with us. My ex just stopped participating in being a father, and I don't understand why. He always says that he is too busy, but when do you get so busy that you can't be a parent? Why would a man just quit being a father? I am totally confused at his actions and don't understand where he's coming from.