Why does she care so much about her babydaddy?

My girlfriend has a kid with this guy and he hasn't even been by to pick the kid up in like 6 months. I keep telling her to not call him or his family to try to make him but she will keep calling him and also now she is "demanding" he give her his address which is crazy because he doesn't even seem to want to see the kid so why would she even want this. Is this just because of the child or is something else going on?

Why does she care so much about her babydaddy?
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