Should I allow my son father back in his life?

My sons, father has not shown any effort in being a father. He’s never saw my son he take care of his daughter that he has with another lady and he keeps saying that he’ll fix it but my question is, should I allow him to fix it on his time? Because I feel like it’s not fair and I’m teaching him that my son comes second.

Should I allow my son father back in his life?
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