How do you explain to a child why their biological father is absent?

My child's dad wants no part in our child's life. He is even going as far as moving overseas so that he doesn't have to be in the child's life and so he doesn't have to pay any kind of child support. I tried my best to get him to want a relationship with our child. To no avail. How do I explain to my child why their father is absent from their life?

How do you explain to a child why their biological father is absent?
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