My son father has not participated in my life?

My son father has not participated in my sons life he’s never made an effort to see my son but he takes care of his daughter that’s one month younger he says that one day he’ll fix it and my question is should I allow him to be in my son life when he try to fix it because I feel that it’s not fair for him to ignore my son now and when he’s ready, I should just except it and allow him to be in my son life it’s not fair

My son father has not participated in my life?
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