And the baby isn't even born yet..
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Sadly the most common reason tends to be that the guy never took her seriously, never intended on experiencing anything greater than sex with her, and she wasn't his first choice as a mother to his child. :/ It's so sad but it's true which is why females should really be careful about who they share their bodies with.
Another reason is that many men just cowardly back out because they don't have their finances together and acknowledge they are mentally and spiritually incapable of achieving a certain type of fatherly role. However, this option seems slightly less common these days due to child support laws. :)1