Why would a dad keep lying about coming to see child/children?

Additional details- He doesn’t say why he didn’t show up and has been doing this for months and doesn’t check up on child at all.
He’s a deadbeat
He just doesn’t want to be around and involved
He’s sneaking around with a woman and spending his time with her instead
He’s just busy
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Why would a dad keep lying about coming to see child/children?
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